Chapter 1 — GENERAL CODE PROVISIONS

(Matrix Adoption Tables are non-regulatory, intended only as an aid to the user. See Chapter 1 for state agency authority and building application.)

Adopt the entire UMC chapter as amended, state-amended sections are listed below: If there is an “X” under a particular state agency’s acronym in this row, it means that a particular state agency has adopted the entire model code chapter, with state amendments.

Each section that a state agency has amended and/or added within a particular chapter is listed. There will be an “X” under the agency’s acronym in the row of the amended and/or added section.

Example:

CALIFORNIA MECHANICAL CODE – MATRIX ADOPTION TABLE

CHAPTER 1 - GENERAL CODE PROVISIONS

(Matrix Adoption Tables are non-regulatory, intended only as an aid to the user. See Chapter 1 for state agency authority and building application.)

Adopt only those sections which are listed below:

If there is an “X” under a particular state agency’s acronym in this row, it means that particular state agency is adopting only specific model code or state-amended sections within this chapter. There will be an “X” in the column under the agency’s acronym, as well as an “X” by each section that the agency has adopted.

Example:

CALIFORNIA MECHANICAL CODE – MATRIX ADOPTION TABLE

CHAPTER 1 - GENERAL CODE PROVISIONS

(Matrix Adoption Tables are non-regulatory, intended only as an aid to the user. See Chapter 1 for state agency authority and building application.)

viii 2025 CALIFORNIA MECHANICAL CODE

HOW TO DISTINGUISH MODEL CODE LANGUAGE FROM CALIFORNIA AMENDMENTS

To distinguish between model code language and incorporated California Amendments, including exclusive California standards, California amendments will appear in italics font print.

Symbols in the margins indicate the status of code changes as follows:

[BSC]

This symbol identifies which State agency(s) by its “acronym” that has amended a section of the model code. For a complete listing of State agency acronyms, see the Application Section within Chapter 1, Division I.

This symbol indicates that a change has been made to a California amendment.

This symbol indicates that a section, paragraph, or table has been revised or relocated within IAPMO model code language.

This symbol indicates deletion of California language.

This symbol indicates where an entire section, paragraph, or table has been deleted from IAPMO model code language.

Revision Markings A double right angle ( « ) in the margin indicates that the text or a table has been relocated within the code.

TIA TIA TIA TIA

TIA indicates that the revision is the result of a Tentative Interim Amendment.

For further information on tentative interim amendments see Section 5 of the IAPMO Regulations Governing Committee Projects available at http://codes.iapmo.org/

A reference in brackets [ ] following a section or paragraph indicates material that has been extracted from another document. This reprinted material is not the complete and official position of the source document on the referenced subject that is represented by the standard in its entirety. Material contained in this document that is taken or extracted from NFPA standards is used with permission of the National Fire Protection Association. This material is not the complete and official position of the NFPA on the reference subject, which is represented solely by the relevant standard in its entirety. NFPA standards can be accessed at www.nfpa.org. In addition, this extracted material may include revisions or modifications developed through IAPMO’s standards development process. Therefore, NFPA disclaims responsibility for the content of this Code.

s not the complete and official position of the NFPA on the reference subject, which is represented solely by the relevant standard in its entirety. NFPA standards can be accessed at www.nfpa.org. In addition, this extracted material may include revisions or modifications developed through IAPMO’s standards development process. Therefore, NFPA disclaims responsibility for the content of this Code.

Text that is extracted pursuant to IAPMO’s Extract Guidelines, but outside of the regular revision process is denoted with the use of the source document in the margin. This text is not fully processed by IAPMO in accordance with ANSI’s public announcement consensus requirements for an American National Standard (ANS) nor approved by ANSI’s Board of Standards Review. The next revision cycle processes such text in accordance with those requirements.

Important Notices and Disclaimers The 2024 edition of the Uniform Mechanical Code is developed through a consensus standards development process approved by the American National Standards Institute. This process brings together volunteers representing varied viewpoints and interests to achieve consensus on mechanical issues. While the International Association of Plumbing and Mechanical Officials (IAPMO) administers the process and establishes rules to promote fairness in the development of consensus, it does not independently test, evaluate, or verify the accuracy of any information or the soundness of any judgments contained in its codes

and standards.

IAPMO disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, or reliance on this document. IAPMO also makes no guarantee or warranty as to the accuracy or completeness of any information published

herein.

In issuing and making this document available, IAPMO is not undertaking to render professional or other services for or on behalf of any person or entity. Nor is IAPMO undertaking to perform any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances.

Updating IAPMO Codes Users of IAPMO codes should be aware that IAPMO codes may be amended from time to time through the issuance of Tentative Interim Amendments or corrected by Errata. IAPMO codes consist of the current edition of the document together with any Tentative Interim Amendments and any Errata in effect.

To access information for a specific code or to determine whether an IAPMO code has been amended through the issuance of Tentative Interim Amendments or corrected by Errata, please visit the IAPMO codes information page on the IAPMO’s website (https://www.iapmo.org/code-development). The codes information page provides a list of IAPMO codes with up-to-date specific information including any issued Tentative Interim

Amendments and Errata.

x 2025 CALIFORNIA MECHANICAL CODE

FOREWORD

Origin and Development The industry has long recognized the advantages of a statewide adopted mechanical code. The first edition of the Uniform Mechanical Code [®] (UMC [®] ) was adopted by IAPMO in 1967. The widespread use of this code over the past five decades by jurisdictions throughout the United States and internationally is testament to its merit.

Publishing of the 2003 Uniform Mechanical Code was a significant milestone because it was the first time in the history of the United States a mechanical code was developed through a true consensus process. The 2024 edition represents the most current approaches in the mechanical field and is the eighth edition developed under the ANSI consensus process. Contributions to the content of this code consists of diverse interests as consumers, enforcing authorities, installers/maintainers, labor, manufacturers, research/standards/testing laboratories, special experts, and users.

The Uniform Mechanical Code provides consumers with complete requirements for the installation and maintenance of heating, ventilating, cooling, and refrigeration systems, while, at the same time, allowing latitude for innovation and new technologies. The public at large is invited and encouraged to take part in IAPMO’s open consensus code development process. This code is updated every three years. The Uniform Mechanical Code is dedicated to all those who, in working to achieve “the ultimate mechanical code,” have unselfishly devoted their time, effort, and personal funds to create and maintain this, the finest mechanical code in existence today.

The Uniform Mechanical Code updates every three years in revision cycles that begin twice each year that takes two years to complete.

Each revision cycle advances according to a published schedule that includes final dates for all major events and contains four basic steps as follows:

1. Proposal Stage;
2. Comment Stage;
3. Association Technical Meeting;
4. Council Appeals and Issuance of Code.

IAPMO develops “full consensus” codes built on a foundation of maximum participation and agreement by a broad range of interests. This philosophy has led to producing technically sound codes that promote health and safety, yet do not stifle design or development.

It is important to stress that the process remains committed to the principles of consensus code development where consensus Technical Committees and Correlating Committees revise codes. The public and membership are offered multiple opportunities to debate, provide input and raise concerns through Amending Motions at the annual Assembly Consideration Session. Anyone may submit an appeal related to the issuance of a document through the IAPMO Standards Council.

he principles of consensus code development where consensus Technical Committees and Correlating Committees revise codes. The public and membership are offered multiple opportunities to debate, provide input and raise concerns through Amending Motions at the annual Assembly Consideration Session. Anyone may submit an appeal related to the issuance of a document through the IAPMO Standards Council.

The 2024 Uniform Mechanical Code is supported by the Mechanical Contractors Association of America (MCAA), the Plumbing-Heating-Cooling Contractors National Association (PHCC-NA), the United Association (UA), and the World Plumbing Council (WPC). The presence of these logos, while reflecting support, does not imply any ownership of the copyright to the UMC, which is held exclusively by IAPMO. Further, the logos of these associations indicate the support of IAPMO’s open consensus process being used to develop IAPMO’s codes and standards.

FOREWORD

The addresses of the organizations are as follows: ASSE – 18927 Hickory Creek Drive, Suite 220 • Mokena, IL 60448 • (708) 995-3019 MCAA – 1385 Piccard Drive • Rockville, MD 20850 • (301) 869-5800 PHCC-NA – 180 S Washington Street, Suite 100 • Falls Church, VA 22040-6808 • (800) 533-7694 RPA – 18927 Hickory Creek Drive, Suite 220 • Mokena, IL 60448 • (877) 427-6601 UA – Three Park Place • Annapolis, MD 21401 • (410) 269-2000 WPC – Auf der Mauer 11 • 8021 Zurich, Switzerland • Secretariat@worldplumbing.org

Adoption The Uniform Mechanical Code is available for adoption and use by jurisdictions in the United States and Internationally. Its use within a governmental jurisdiction is accomplished through adoption by reference in accordance with applicable jurisdictional laws. At adoption, jurisdictions should insert the applicable information in bracketed words in the sample ordinance. The sample legislation for adoption of the Uniform Mechanical Code on page ix provides key components, regulations and resolutions.

Revision Markings Solid vertical lines in the margins indicate a technical change from the requirements of the 2021 edition. An arrow ( ) in the margin indicates where an entire section, paragraph, exception, figure, or table has been deleted, or an item in a list of items or a table has been deleted.

A double right angle ( « ) in the margin indicates that the text, table, or figure has been relocated within the code. The table found on page xxi points out the relocations in the 2024 edition of the Uniform Mechanical Code .

TIA TIA indicates that the revision is the result of a Tentative Interim Amendment. TIA For further information on tentative interim amendments see Section 5 of the IAPMO TIA TIA Regulations Governing Committee Projects available at http://www.iapmo.org/code**TIA** development

A reference in brackets [ ] following a section or paragraph indicates material that has been extracted from another document. A reference in brackets { } following a section or paragraph indicates material that has been extracted from another document and has been modified further by the Technical Committee. This reprinted material is not the complete and official position of the source document on the referenced subject that is represented by the standard in its entirety. Material contained in this document that is taken or extracted from NFPA standards is used with permission of the National Fire Protection Association. This material is not the complete and official position of the NFPA on the reference subject, which is represented solely by the relevant standard in its entirety. NFPA standards can be accessed at www.nfpa.org. In addition, this extracted material may include revisions or modifications developed through IAPMO’s standards development process. Therefore, NFPA disclaims responsibility for the content of this code.

Text that is extracted pursuant to IAPMO’s Extract Guidelines, but outside of the regular revision process is denoted with the use of the source document in the margin. This text is not fully processed by IAPMO in accordance with ANSI’s public announcement consensus requirements for an American National Standard (ANS) nor approved by ANSI’s Board of Standards Review. The next revision cycle processes such text in accordance with those requirements.

xii 2025 CALIFORNIA MECHANICAL CODE

FORMAT OF THE UNIFORM MECHANICAL CODE

The format of the Uniform Mechanical Code (UMC) arranges each chapter in accordance with a specific subject matter. However, Chapter 3 is dedicated to general requirements that are applicable to every chapter. The subject matters are divided as follows:

FORMAT OF THE UNIFORM MECHANICAL CODE

The following is a summary of the scope and intent of the provisions addressed within the chapters and appendices of the Uniform Mechanical Code :

Chapter 1 Administration. Chapter 1 regulates the application, enforcement, and administration of subsequent requirements of the code. As well as establishing the scope of the code, this chapter is concerned with enforcing the requirements contained in the body of the code. A mechanical code, as with any other code, is intended to be adopted as a legally enforceable document to safeguard health, safety, property, and public welfare. The code cannot be effective without satisfactory provisions for its administration and enforcement. The Authority Having Jurisdiction is to review the proposed and completed work and decide whether a mechanical system conforms to the code requirements. As a public servant, the Authority Having Jurisdiction enforces the code in an unbiased proper manner. The design professional is responsible for the design of a safe mechanical system. The contractor is responsible for installing the system in accordance with the plans.

Chapter 2 Definitions. To maintain consistency and encourage the use of common terminology, Chapter 2 establishes definitions to provide clarity of terms and promote the use of a common language throughout the code. Understanding definitions within the context of their application enables greater collaboration, efficiency, standardization, and interpretation in applying and enforcing terms used throughout the code. Codes are technical documents, and every term can impact the meaning of the code text. Terms not defined have a normally accepted meaning.

Chapter 3 General Regulations. Chapter 3 regulates the general requirements, not specific to other chapters, for installing mechanical systems. Many regulations are not specific mechanical requirements but relate to the overall mechanical system. This chapter contains safety requirements for appliance location and installation, appliance and system access, condensate disposal, clearances to combustibles, and return or outside air used in mechanical systems. Listing method of approval, based on applicable nationally recognized standards for the safe and proper installation of mechanical systems, is essential to ensure protection of public health, safety, and welfare. These safety requirements provide protection for piping, tubing, materials, and structures, including provisions for installation practices addressing stress and strain, sleeving, and hanger support. The building’s structural stability is protected by the regulations for cutting and notching of structural members.

al systems, is essential to ensure protection of public health, safety, and welfare. These safety requirements provide protection for piping, tubing, materials, and structures, including provisions for installation practices addressing stress and strain, sleeving, and hanger support. The building’s structural stability is protected by the regulations for cutting and notching of structural members.

Chapter 4 Ventilation Air. Chapter 4 regulates the minimum requirements for ventilation air supply, exhaust, and makeup air for occupiable spaces within a building. Building ventilation is one important factor affecting the relationship between airborne transmission of respiratory infections and the health and productivity of workers. Ventilation air may be composed of mechanical or natural ventilation, infiltration, recirculated air, transfer air, or a suitable combination of these. Providing a comfortable and healthy indoor environment for building occupants is of primary concern. When determining ventilation rates, typical and unusual significant sources of indoor pollution need to be controlled. Areas such as kitchens, bathrooms, and laundries are all built to allow specific functions. These spaces produce pollutants such as moisture, odors, volatile organic compounds, particles, or combustion byproducts. The purpose of local exhaust is to control concentrates of these pollutants in the room into which they were emitted and to reduce the spread of pollutants into other parts of the occupancy. Local exhaust ventilation is the source control for pollution that is expected in certain rooms. Using local exhaust to extract contaminants before they mix with the indoor environment is essential.

Chapter 5 Exhaust Systems. Chapter 5 regulates the minimum requirements for exhaust systems. Chapter 5 contains two parts: Part I provides exhaust requirements for environmental air ducts and product conveying systems; Part II provides exhaust requirements for commercial hoods and kitchen ventilation. Environmental air ducts include exhaust ducts used for transporting the air from domestic kitchens, bathrooms, shower rooms, locker rooms, janitor’s closets, and clothes dryers. Systems that carry nonabrasive exhaust, such as smoke, moderate abrasives such as sawdust, and high abrasives such as manganese or acid vapors use product-conveying ducts. Part II provides the minimum fire safety requirements related to the design, installation, inspection, and maintenance of grease-type operations, such as cooking, for both fuel-gas and solid fuel. Cooking produces a significant amount of smoke, fumes, vapors, heat, and other pollutants. Therefore, acceptable kitchen ventilation is necessary to prevent fires from the build-up of grease and to provide the occupants protection from smoke, unpleasant odors, pollutants, and dangerous gases. There are two types of exhaust hoods (Type I and Type II) used in commercial kitchen applications.

xiv 2025 CALIFORNIA MECHANICAL CODE

FORMAT OF THE UNIFORM MECHANICAL CODE

Type I hoods are intended to be installed above equipment or appliances that generate grease or smoke. Type II hoods are intended to be installed above equipment or appliances that generate steam, vapor, heat, or odors and do not generate grease or smoke.

Chapter 6 Duct Systems. Chapter 6 regulates requirements for ducts and plenums that are portions of a heating, cooling, ventilation, or exhaust system. This chapter contains material and installation requirements for metal, gypsum, factory-made, flexible, and plastic ducts. It also contains provisions for duct insulation, dampers, fire protection, and automatic shutoff for the building’s air distribution system. It is worth noting that exhaust ducts are regulated by Chapter 5, and combustion air ducts are regulated by Chapter 7.

Chapter 7 Combustion Air. Chapter 7 regulates combustion air requirements for ventilation and dilution of flue gases for appliances installed in buildings. Fuel-gas appliances not regulated by chapter include direct vent appliances and Type I clothes dryers. Makeup air requirements for Type I clothes dryers are located in Chapter 5. Chapter 7 provides acceptable methods for supplying satisfactory combustion air to ensure proper combustion. Combustion air can be supplied by using indoor combustion air or by introducing the air from the outdoors.

Combustion is the rapid oxidation of fuel to release energy. The oxygen required to release the energy from the fuel normally comes from the air. Incomplete combustion of fuel occurs when inadequate oxygen is provided to the appliance. Combustion is needed to provide ventilation cooling for the casing and internal controls. When a lack of oxygen occurs, some of the carbon is not oxidized, and carbon monoxide forms.

Chapter 8 Chimneys and Vents. Chapter 8 regulates the installation, design, and construction of venting systems for fuel-burning appliances. The provisions addressed within this chapter follow procedures an installer would use to design or evaluate a venting system. Many requirements apply to the design and construction of venting systems, chimneys, installation of gas vents, and the sizing of venting system for a Category I appliance. Sizing venting systems require rigorous engineering calculations. However, the venting sizing requirements and sizing tables in this chapter already perform the calculations for the benefit of the end user.

Combustion appliances produce products of incomplete combustion, including potentially harmful carbon monoxide (CO). It is desirable to vent these products to the outdoors. Although the gas is clean-burning fuel, the products of combustion must not be allowed to collect within a building.

Chapter 9 Installation of Specific Appliances. Chapter 9 regulates the minimum requirements for the design, construction and installation of specific appliances. The provisions address the minimum requirements for gas-fired appliances, oil-fired appliances, wood-fired appliances, and electric-type appliances. In addition to the requirements of this chapter, appliances are also required to comply with the general requirements of Chapter 3.

s.** Chapter 9 regulates the minimum requirements for the design, construction and installation of specific appliances. The provisions address the minimum requirements for gas-fired appliances, oil-fired appliances, wood-fired appliances, and electric-type appliances. In addition to the requirements of this chapter, appliances are also required to comply with the general requirements of Chapter 3.

Chapter 10 Boilers and Pressure Vessels. Chapter 10 regulates the construction, installation, operation, repair, and alteration of boilers and pressure vessels. The safety provisions within this chapter address controls and limit devices for automatic boilers, methods of determining expansion tank capacities, discharge piping, relief valves, shutoff valves, gas-pressure and combustion regulators, and inspections and tests. Potable water heaters are free from the requirements of Chapter 10 as they are within the scope of the Uniform Plumbing Code (UPC).

Pressure vessels store large amounts of energy and must comply with ASME Boiler and Pressure Vessel Code (BPVC) Section VIII.1. The stored energy must be contained to prevent disastrous failures. Boilers must comply with ASME BPVC Section I, ASME BPVC Section IV, or NFPA 85. Installing a safety relief valve and expansion tank prevents pressures in the tank from exceeding the design threshold.

Chapter 11 Refrigeration. Chapter 11 regulates the design, installation, and construction requirements of refrigeration systems and the installation and construction of cooling towers. Refrigeration is a method used for achieving heat transfer to cool spaces. Refrigerants are the most common medium used to transfer the heat energy from the low-temperature level to the high-temperature level. Table

FORMAT OF THE UNIFORM MECHANICAL CODE

1102.3 lists the most commonly used refrigerants and is labeled by a number. The concentration limits provided in Table 1102.3 are useful for the quantity of refrigerant required to cool a volume of space safely.

A major milestone reached in the industry was the introduction of lower flammability refrigerants such as A2L and B2L. The industry’s concerns to address lower Global Warming Potential (GWP) refrigerants led to the development of these lower flammability refrigerants. Chapter 11 does not only include these lower flammability refrigerants in Table 1102.3, but it also contains specific A2L and B2L provisions to address the precautions necessary for the proper use of these products. In particular, high-probability systems using A2L refrigerants for human comfort applications are covered by provisions which include refrigerant concentration limits, mechanical ventilation, ignition sources, compressors and pressure vessels, and refrigerant sensors.

.3, but it also contains specific A2L and B2L provisions to address the precautions necessary for the proper use of these products. In particular, high-probability systems using A2L refrigerants for human comfort applications are covered by provisions which include refrigerant concentration limits, mechanical ventilation, ignition sources, compressors and pressure vessels, and refrigerant sensors.

In addition, Chapter 11 addresses other minimum requirements for refrigeration systems such as refrigeration machinery rooms (including ventilation), relief valves, and pressure vessels. Apart from refrigerants, the chapter also addresses minimum requirements for systems that use other mediums such as ammonia and brine systems. For ammonia systems, such systems are required to comply with IIAR 2, IIAR 3, IIAR/ANSI 4, IIAR 5, and IIAR 6.

Chapter 12 Hydronics. Chapter 12 regulates hydronic systems that are part of heating, cooling, ventilation, and conditioning systems. Such piping systems include steam, hot water, radiant heating and cooling, chilled water, steam condensate, condenser water, ground source heat pump systems, snow and ice melt systems, ambient temperature loops, and district ambient temperature loops. Provisions within this chapter addressing ground source heat pumps and ambient temperature loops apply to the hydronic portions of the system. Geothermal energy systems, including ground source heat pumps and ambient temperature loops, are regulated by Chapter 17.

Materials for piping and tubing must meet the working temperature and pressure of the system. In addition, materials must be compatible with the transfer medium to prevent deformation, bursting, or any chemical action between the material and the transfer medium. The allowable joining methods for piping or tubing are provided for application and enforcement purposes.

Chapter 13 Fuel Gas Piping. Chapter 13 regulates gas piping systems in a building, structure or within the property lines of buildings up to 5 psi. Gas piping systems must supply the minimum volume of gas required by each gas appliance to perform their proper operation under working conditions without exceeding the maximum pressure specified by each manufacturer. Because of the hazards associated with fuel gas, it is important to ensure the gas system has been inspected and tested, and that it is safe to turn on the gas supply to the building.

Chapter 14 Process Piping. Chapter 14 regulates process piping that typically is found in refineries. Process piping is considered the piping or tubing portion that transports liquid or gas, which is used directly in research, laboratory, or production process. This chapter may be used with another chapter of the code. For example, refrigeration piping, fuel gas piping, or fuel oil piping may need to comply with this chapter for process piping and the applicable chapter for materials, design, and installation.

g is considered the piping or tubing portion that transports liquid or gas, which is used directly in research, laboratory, or production process. This chapter may be used with another chapter of the code. For example, refrigeration piping, fuel gas piping, or fuel oil piping may need to comply with this chapter for process piping and the applicable chapter for materials, design, and installation.

Chapter 15 Solar Energy Systems. Chapter 15 refers the user to the Uniform Solar, Hydronics and Geothermal Code (USHGC) for solar energy system requirements. The USHGC contains comprehensive design, installation, and construction requirements for all types of solar thermal systems, such as drainback, thermosiphon, open-loop, and closed-loop systems. The USHGC also addresses installation of solar photovoltaic (PV) systems including array circuit(s), inverter(s), and controller(s) for such systems.

Chapter 16 Stationary Power Plants. This chapter provides minimum requirements for stationary fuel cell power plants. A fuel cell is a device that produces electricity by a chemical reaction. Fuel cells have been used mostly for satellites. However, the costs of fuel cells have decreased to a point where they are now economically attainable. With the increase in electricity costs, fuel cells are being considered as an alternative for producing electricity.

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Chapter 17 Geothermal Energy Systems and Ambient Temperature Loops. Chapter 17 regulates the design, installation, construction, and location of geothermal energy systems and ambient temperature loops (ATLs). This chapter provides the minimum safety requirements for various types of geothermal systems, including building systems coupled with a ground-heat exchangers, submerged heat exchangers using water-based fluid as a heat transfer medium, and groundwater (well). For ease of use and clarification on the applicability of geothermal provisions, Chapter 17 is divided into five parts pertaining to general provisions for all types of geothermal systems, closed-loop systems, open-loop systems, direct-exchange (DX) systems, and ambient temperature loops. For district ambient temperature loops, including those utilizing multiple hybrid systems, Part I through Part V are applicable.

In order to properly design a geothermal system, it is important to know the seasonal variation in the soil temperature, as well as the soil’s inherent capability to store and transmit heat, namely its heat capacity and thermal conductivity. In addition, a properly designed heat pump distribution system is essential for the distribution of geothermal energy.

Materials for piping and tubing must meet the working temperature and pressure of the system. Furthermore, materials must be compatible with the transfer medium to prevent deformation, bursting, or any chemical action between the material and the transfer medium. Approved materials for indoor piping, fittings, and accessories that are a part of a groundwater system as well as the allowable joining methods for piping or tubing are provided for application and enforcement purposes.

Chapter 18 Referenced Standards. Chapter 18 provides two comprehensive tables with referenced standards. The standards listed in Table 1801.1 are applied as indicated in the applicable reference section(s). A list of additional approved standards, publications, practices, and guides that are not referenced in specific sections appear in Table 1801.2.

Referenced standards set forth specific details of accepted practices, materials specifications, or test methods in many specialized applications. Standards provide an efficient method of conveying complex information and specifications on the performance requirements for materials, products, systems, application, and installation. The manner and purpose for a standard’s use and, in turn, code compliance, must be definitive in all references to the standard. If the standard is intended to be a requirement for judging code compliance, the code must state its intent for use. The standard should adequately address a defined need and at the same time specify the minimum performance requirements, technical characteristics and methods of testing, and required test results.

The referenced standards tables are organized in a manner that makes it easy to find specific standards in alphabetical order, and by acronym of the publishing agency of the standard. The tables list the title of the standard, the edition, and any addenda. Contact information for each publishing agency is provided at the end of the chapter.

Appendix A Residential Plans Examiner Review Form for HVAC System Design. A residential plans examiner review form is located in this appendix as an example to assist users in identifying whether the HVAC system has followed the approved procedures for system design (loads, equipment, and ducts).

Appendix B Procedures to be Followed to Place Gas Equipment in Operation. Appendix B provides requirements for the procedures that apply after an appliance is installed in place, piped, and connected to its venting system. The requirements include adjusting the burner input, air adjustments, verifying operation of safety shutoffs, automatic ignition, and protective devices, checking draft for vent-connected appliances, and operating instructions.

Appendix C Installation and Testing of Oil (Liquid) Fuel-Fired Equipment. Appendix C governs the installation, testing, or repair of oil or liquid fuel-burning equipment used in buildings or structures and equipment.

Appendix D Fuel Supply: Manufactured/Mobile Home Parks and Recreational Vehicle Parks. The provisions of this appendix apply to the fuel gas piping systems of mobile home and recreational vehicle parks. These provisions also apply to the use, maintenance, and installation for supplying fuel gas for accessory buildings or structures, and building components.

FORMAT OF THE UNIFORM MECHANICAL CODE

Appendix E Sustainable Practices. This appendix provides a comprehensive set of technically sound provisions that encourage sustainable practices and works toward improving the design and construction of mechanical systems that result in a positive long-term environmental impact. Environmental sustainability is important because it involves natural resources that human beings need for economic or manufactured capital. Their sustainability is defined by their reliance on infinitely available resources that are naturally occurring, constant, and free to access.

Appendix F Sizing of Venting Systems and Outdoor Combustion and Ventilation Opening Design. Appendix F provides added information on the sizing of gas vents. This appendix is useful to the end user for the proper sizing of venting systems. A series of examples are given that show how to use the tables and other requirements of Chapter 8. In addition, Appendix F shows an example of how to determine the required combination of indoor and outdoor combustion air opening sizes for appliances under Chapter 7. The combustion air example also provides a table that contains the required volume of space per the appliance Btu/h input based on the standard method.

Appendix G Example Calculation of Outdoor Air Rate. Appendix G gives an example of how to calculate the required outdoor air rate under Chapter 4.

Appendix H Professional Qualifications. Appendix H provides a baseline of knowledge for installers, inspectors, or employers working with and around systems covered within the scope of this code to maintain health and safety.

Appendix I Indoor Horticultural Facilities. Appendix I addresses indoor spaces using environmental controls for horticultural cultivation and processing of plants for human ingestion, inhalation, and topical application. The appendix includes recommendations pertaining to fire protection and suppression systems, carbon dioxide detection systems, flammable solvents, ventilation and exhaust systems, particulate and odor control, and fumigation.

pendix I addresses indoor spaces using environmental controls for horticultural cultivation and processing of plants for human ingestion, inhalation, and topical application. The appendix includes recommendations pertaining to fire protection and suppression systems, carbon dioxide detection systems, flammable solvents, ventilation and exhaust systems, particulate and odor control, and fumigation.

Appendix J Clean Air Delivery. Appendix J provides criteria for an increased level of protection for occupant health by delivering and monitoring clean air in occupied areas of certain buildings. This appendix addresses Demand Control Ventilation (DCV) for occupancy groups A, B, E, and I and recommends that each occupiable zone have CO 2 sensors which communicate with building mechanical systems to adjust airflow rates and maintain acceptable CO 2 levels. Additionally, this appendix contains provisions for mechanical system controls pertaining to sensor calibration, intervals for collected data, and automatic remediation actions to increase the amount of outdoor air provided to each occupiable zone. The CO 2 sensors addressed in this appendix are intended to give notifications that can assist with awareness of unhealthy levels and give insight to building occupants as to when mitigation action is necessary.

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SAMPLE LEGISLATION FOR ADOPTION OF THE UNIFORM MECHANICAL CODE

The Uniform Codes are designed to be adopted by jurisdictions through an ordinance. Jurisdictions wishing to adopt the 2024 Uniform Mechanical Code as an enforceable regulation governing mechanical systems by reference should ensure the legal basis under which adoption and implementation are included in the ordinance.

The following sample ordinance is a guide for drafting an ordinance for adoption that addresses key components regulations and resolutions.

ORDINANCE NO.

An ordinance of the [JURISDICTION] adopting the 2024 edition of the Uniform Mechanical Code, regulating and controlling the design, construction, quality of materials, erection, installation, alteration, repair, location, relocation, replacement, addition to, use or maintenance of mechanical systems in the [JURISDICTION]; providing for the issuance of permits and collection of fees therefor; repealing Ordinance No. of the

[JURISDICTION] and all other ordinances and parts of the ordinances in conflict therewith.

The [GOVERNING BODY] of the [JURISDICTION] does ordain as follows:

Section 1 Codes Adopted by Reference. That certain documents, three (3) copies of which are on file in the office of the [JURISDICTION'S KEEPER OF RECORDS] and the [JURISDICTION], being marked and designated as the 2024 Uniform Mechanical Code, including Appendix Chapters [FILL IN THE APPENDIX CHAPTERS BEING ADOPTED], as published by the International Association of Plumbing and Mechanical Officials, be and is hereby adopted as the Code of the [JURISDICTION], in the State of [STATE NAME] regulating and controlling the design, construction, quality of materials, erection, installation, alteration, repair, location, relocation, replacement, addition to, use or maintenance of mechanical systems as herein provided; providing for the issuance of permits and collection of fees therefor; and each and all of the regulations, provisions, penalties, conditions and terms of such 2024 Uniform Mechanical Code on file in the office of the

[JURISDICTION] are hereby referred to, adopted, and made a part hereof, as if fully set out in this ordinance.

Section 2 Modifications. The following sections are hereby revised: Section 101.1. Insert: [NAME OF JURISDICTION] Section 104.5. Insert: [APPROPRIATE FEE SCHEDULE]

Section 3 Conflicting Ordinances Repealed. That Ordinance No. of [JURISDICTION] entitled

[TITLE OF THE ORDINANCE OR ORDINANCES IN EFFECT AT THE PRESENT TIME SO THAT THEY WILL BE REPEALED BY MENTION] and all other ordinances or parts of ordinances in conflict herewith are hereby repealed.

Section 4 Preemption. [JURISDICTION] hereby fully occupies and preempts the entire field of regulation of design, construction, quality of materials, erection, installation, alteration, repair, location, relocation, replacement, addition to, use or maintenance of mechanical systems; and provision for the issuance of permits and collection of fees therefor; within the boundaries of [JURISDICTION]. [AS APPROPRIATE] Cities, towns, and counties or other municipalities may enact only those laws and ordinances relating to this field as specifically authorized by state law and consistent with this ordinance. Local laws and ordinances that are inconsistent with, more restrictive than, or exceed the requirements of [ORDINANCE NO.] shall not be enacted and are hereby expressly preempted and repealed, regardless of the nature of the code, charter, or home rule status of such city, town, county, or municipality.

Section 5 Severability. That if any section, subsection, sentence, clause or phrase of this ordinance is, for any reason, held to be unconstitutional, such decision shall not affect the validity of the remaining portions of this ordinance. The [GOVERNING BODY] hereby declares that it would have passed this ordinance, and each section, subsection, clause or phrase thereof, irrespective of the fact that any one or more sections, subsections, sentences, clauses and phrases be declared unconstitutional.

, for any reason, held to be unconstitutional, such decision shall not affect the validity of the remaining portions of this ordinance. The [GOVERNING BODY] hereby declares that it would have passed this ordinance, and each section, subsection, clause or phrase thereof, irrespective of the fact that any one or more sections, subsections, sentences, clauses and phrases be declared unconstitutional.

Section 6 Legal Notice. That the [JURISDICTION'S KEEPER OF RECORDS] is hereby ordered and directed to cause this ordinance to be published. (An additional provision may be required to direct the number of times the ordinance is to be published and to specify that it is to be in a newspaper in general circulation. Posting may also be required.)

Section 7 Violations and Penalties. [INCORPORATE PENALTIES FOR VIOLATIONS]

Section 8 Effective Date. That this ordinance and the rules, regulations, provisions, requirements, orders and matters established and adopted hereby shall take effect and be in full force and effect [TIME PERIOD] from and after the date of its final passage and adoption.

COMMITTEE ON UNIFORM MECHANICAL CODE

These lists represent the membership at the time the Committee was balloted on the final text of this edition. Since that time, changes in the membership may have occurred.

IAPMO Standards Council Bill Erickson, Chairperson, CJ Erickson Plumbing Company [I/M]

JT Baca, State of New Mexico [E]

Laura Ceja, United Association [L]

Rick Coffman, City of Cedar Falls, Retired [C]

Marty Cooper, Vice Chairperson, City of Foster City [E]

Jim Imprescia, City of Leominster [E]

Doug Marian, District Council 16 [L]

Jim Stack, Stack Plumbing, Inc. [I/M]

Don Summers, Plumber’s & Pipefitters Training Center [L]

Nonvoting

Gabriella M. Davis, Secretary, IAPMO Hugo Aguilar, Recording Secretary, IAPMO

IAPMO Uniform Mechanical Code Technical Committee Harvey Kreitenberg, Chairperson, Harvey Kreitenberg & Associates [SE]

Bob Adler, 4 Leaf, Inc. [E] Sarah Aguilar, Ciari Plumbing & Heating [I/M] Rawand Aryan, City of Los Angeles Department of Building & Safety [E] Julius Ballanco, JB Engineering & Code Consulting [SE] DJ Berger, National ITC Corporation [U] Michael Cudahy, Plastic Pipe & Fittings Association (PPFA) [M] David Dias, Sheet Metal Workers Local 104 [L] Jay Egg, EggGeothermal Consulting [C] Pennie Feehan, Copper Development Association (CDA) [M] Brian Fenty, Self [E] Aaron Gunzner, Air Movement and Control Association International (AMCA) [R/S/T] John Hamilton, National Energy Management Institute Committee (NEMIC) [R/S/T] John Heine, Heine Plumbing & Heating [I/M] Ralph Koerber, Air Duct Council [M] Lance MacNevin, Plastics Pipe Institute (PPI) [SE]

g [C] Pennie Feehan, Copper Development Association (CDA) [M] Brian Fenty, Self [E] Aaron Gunzner, Air Movement and Control Association International (AMCA) [R/S/T] John Hamilton, National Energy Management Institute Committee (NEMIC) [R/S/T] John Heine, Heine Plumbing & Heating [I/M] Ralph Koerber, Air Duct Council [M] Lance MacNevin, Plastics Pipe Institute (PPI) [SE]

Dave Mann, CA State Pipe Trades Council [L] John Nielsen, State of Idaho - Division of Building Safety [E] Phil Ribbs, PHR Consultants [SE] Robert Sewell, Lescure Company [U] Donald Cary Smith, Sound Geothermal Corporation [SE] Don Taylor, Dittmann Plumbing [U] Mark Terzigni, Sheet Metal & Air Conditioning Contractors’ National Association (SMACNA) [R/S/T] April Trafton, Donald F. Dickerson Associates [SE] Phil Trafton, American Society of Heating, Refrigerating & Air-Conditioning Engineers (ASHRAE) [R/S/T] Chris Van Rite, Air Distribution Institute (ADI) [M] Robert Vilches, United Association [L] Randy Young, Northern CA Valley Sheet Metal Industry JATC [L] Chuck White, Plumbing-Heating-Cooling Contractors National Association (PHCC-NA) [I/M] Bob Wiseman, Air Conditioning Contractors of America (ACCA) [I/M]

Mike Afonso, UA Local 342 [L] David Bixby, Air Conditioning Contractors of America (ACCA) [I/M] Richard Church, Plastic Pipe & Fittings Association (PPFA) [M] Andrew Davie, Mesa Energy Systems Inc. [U] Duane Davis, Sheet Metal & Air Conditioning Contractors’ National Association (SMACNA) [R/S/T] Kristy Egg, EggGeothermal Consulting [C] Michael Galfano, United Association [L] Mat Hattich, UA Local 342 [L]

Alternates

Shawn Hargis, City of Los Angeles Department of Building & Safety [E] Robert Kuks, Northern CA Joint Apprenticeship Committee [L] Tim Orris, Air Movement and Control Association International (AMCA) [R/S/T] Luis Reyes, National ITC Corporation [U] Chris Ruch, National Energy Management Institute Committee (NEMIC) [R/S/T] Jason Shelton, Air Duct Council [M] Bob Whittington, Air Distribution Institute (ADI) [M]

Nonvoting

Alexander Ing, National Fire Protection Association (NFPA) [R/S/T] Matthew Barker, National Fire Protection Association (NFPA) [R/S/T] Taylor Duran, IAPMO Staff Liaison David Gans, Ex-Officio IAPMO [E]

COMMITTEE MEMBERSHIP CLASSIFICATION ABBREVIATIONS

These classifications apply to Technical Committee members and represent their principal interest in the activity of a committee. M Manufacturer : A representative of a maker or marketer of a product, assembly or system, or portion thereof, that is affected by the standard. U User : A representative of an entity that is subject to the provisions of the standard or that voluntarily uses the standard. I/M Installer/Maintainer : A representative of an entity that is in the business of installing or maintaining a product, assembly or system affected by

the standard.

L Labor : A labor representative or employee concerned with safety in the workplace. R/S/T Research/Standards/Testing Laboratory : A representative of an independent research organization; an organization that develops codes, standards or other similar documents; or an independent testing laboratory. E Enforcing Authority : A representative or an agency or an organization that promulgates and/or enforces standards. C Consumer : A person who is, or represents, the ultimate purchaser of a product, system, or service affected by the standard, but who is not

included in the User classification.

SE Special Expert : A person not representing any of the previous classifications, but who has special expertise in the scope of the standard or portion

thereof.

xx 2025 CALIFORNIA MECHANICAL CODE

SECTION RELOCATION

SECTION RELOCATION

xxii 2025 CALIFORNIA MECHANICAL CODE

RELATED PUBLICATIONS AND SERVICES

The Documents Listed are Not by this Reference Adopted by The State of California.

IAPMO provides a variety of other products which are useful for inspectors, building officials, architects, engineers,

manufacturers, contractors, plumbers, and apprentices.

IAPMO Headquarters Directory

4755 East Philadelphia Street, Ontario, California 91761-2816

Publication Order Desk Phone: 800-85-IAPMO

Publication Toll Free Fax: 877-85-CODES

E-mail: iapmo@iapmo.org

Website: www.iapmo.org

Free Code Question: 800-201-0335

Uniform Mechanical Code – 2024 Edition:

The Uniform Mechanical Code contains complete requirements for the installation and maintenance of heating, ventilating, cooking and refrigeration systems.

Uniform Mechanical Code Illustrated Training Manual:

Contains technical diagrams and illustrations that demonstrate the intent and use of the UMC. A great reference for everyone involved in Mechanical HVACR design and installation.

Uniform Mechanical Code Study Guide:

The Study Guide is a complete self-study course for learning the UMC. A big help in getting ready for a certification exam! This book is the perfect complement to the UMC Illustrated Training Manual.

Guide to Important Code Questions to the Uniform Mechanical Code:

An excellent reference for learning and understanding mechanical code changes and identifies code changes between editions. It is a useful tool for preparing code change proposals.

Uniform Plumbing Code – 2024 Edition:

The Uniform Plumbing Code is the most widely adopted plumbing code in the world. The 2024 edition contains complete “turnkey” requirements for the installation and maintenance of plumbing systems, all in one easy to use book.

Uniform Plumbing Code Illustrated Training Manual:

The UPC Illustrated Training Manual is an excellent reference for anyone involved in the plumbing industry. It contains an extensive definitions section and several hundred comprehensive technical diagrams and illustrations. It serves as a textbook, and it also is useful as a valuable tool for explaining the intent and use of the Code.

Uniform Plumbing Code Study Guide:

This book is the perfect complement to the UPC Illustrated Training Manual. Alone, it constitutes a complete self-study course for learning the UPC. It has hundreds of questions, general practice exams, and plumbing math, pipe sizing exercises and fitting identification. A big help in getting you ready for a certification exam!

Guide to Important Code Questions to the Uniform Plumbing Code:

An excellent reference for learning and understanding plumbing code changes and identifies code changes between editions. It is a useful tool for preparing code change proposals.

RELATED PUBLICATIONS AND SERVICES

The Documents Listed are Not by this Reference Adopted by The State of California.

Uniform Swimming Pool, Spa, and Hot Tub Code – 2024 Edition: The Uniform Swimming Pool, Spa and Hot Tub Code contains complete and current requirements for the erection, installation, alteration, repair, relocation, replacement, addition to and use or maintenance of these systems.

Uniform Solar, Hydronics and Geothermal Code – 2024 Edition: The Uniform Solar, Hydronics and Geothermal Code contains complete requirements for the erection, installation, alteration, addition, repair, relocation, replacement, addition to, use or maintenance of these systems.

Drain Waste and Vent Calculator:

A slide-rule style calculator provides quick and simple access to the fixture unit and sizing tables of Chapter 7 of the UPC.

Water Sizing Calculator: Sizing water systems becomes a much simpler task with the use of this handy slide-rule style calculator.

Natural Gas Pipe Sizing Calculator: This Natural Gas Pipe Sizing Calculator is presented in an easy to use and read slide-rule format. Designed for systems with a supply pressure of six to eight inches of water column, all pipe capacities are given in cubic feet per hour.

Trailer Standards:

IAPMO has developed a number of standards for specialty products used in manufactured homes and recreational vehicles. These standards are available individually, or they may be purchased as a set.

Education and Training Seminars: IAPMO specializes in conducting training and education, including fulfilling continuing education requirements, on the UPC and UMC as well as all of the most commonly utilized codes in the Construction Trades. Special seminars on industry or code subjects are expeditiously created and delivered upon request. Please call to obtain the seminar schedule or to arrange for a custom special seminar.

Backflow Prevention Institute – IAPMO:

The IAPMO Backflow Prevention Institute provides professional education and training for the control of hazards to our water supply and is dedicated to water-system safety worldwide. The Institute provides training in backflow prevention and cross-connection control. This program includes backflow preventers, testers, repairers, cross-connection control surveyors, program administrators and fire-sprinkler backflow preventer testers. Each of these courses provides compliance certification to American Society of Sanitary Engineering (ASSE) Series 5000 Professional Qualification Standards.

Backflow Prevention Reference Manual:

This unique 300-page manual contains full-color illustrations and sections relating to real-world installations, backflow prevention, testing cross-connection control, repair and inspections. The manual is an excellent textbook and a reference the inspectors in every jurisdiction should have access too. It is also an important resource for system designers, urban planners and utility companies – professionals on both sides of the water meter.

ANSI Z124 Standards:

These standards are written to specifically address a variety of plastic plumbing fixtures and components. They are available individually, or may be grouped for quantity discounts.

IAPMO Installation Standards:

IAPMO standards committees have formulated installation standards for a wide variety of commonly used plumbing materials and systems. The IAPMO installation standards are included after the text of the Uniform Plumbing Code, or can be purchased separately.

xxiv 2025 CALIFORNIA MECHANICAL CODE

RELATED PUBLICATIONS AND SERVICES

The Documents Listed are Not by this Reference Adopted by The State of California.

Material and Property Standards: IAPMO does not generally develop material and property standards, but when a need exists the Association will take a leadership role by filling the void. They are available, are subject to amendments and are withdrawn when recognized consensus standards are formulated.

OFFICIAL Magazine: IAPMO’s quarterly publication features informative articles related to Plumbing and Mechanical HVACR installations, award winning general interest features, technical columns and industry updates. Subscriptions are available and all IAPMO members receive a free copy of every issue!

Membership in IAPMO: IAPMO membership is open to all interested persons. Membership categories include Student, Individual, Senior, Organizational and Governmental. Member benefits include discounted prices on IAPMO publications, a subscription to Official magazine, and numerous educational and training opportunities.

HOW TO CONTACT IAPMO

Mailing Address: 4755 East Philadelphia Street, Ontario, California 91761-2816

Main Number: 909-472-4100 • Publication Orders: 800-85-IAPMO • Publication Fax: 877-85-CODES

Website: www.iapmo.org • Office Hours: Monday – Friday, 8am – 5pm Pacific Time

xxvi 2025 CALIFORNIA MECHANICAL CODE

TABLE OF CONTENTS

CHAPTER 1 DIVISION I

CALIFORNIA ADMINISTRATION . . . . 1

1.1.0 General . . . . . . . . . . . . . . . . . . . . . . .3

1.1.1 Title . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.1.2 Purpose . . . . . . . . . . . . . . . . . . . . . .3

1.1.3 Scope . . . . . . . . . . . . . . . . . . . . . . . .3

1.1.4 Appendices . . . . . . . . . . . . . . . . . . .4

1.1.5 Referenced Codes . . . . . . . . . . . . . .4

1.1.6 NonBuilding Standards, Orders,

and Regulations . . . . . . . . . . . . . . . .4

1.1.7 Order of Precedence and Use . . . . .4

1.1.8 City, County, or City and County

Amendments, Additions or

Deletions . . . . . . . . . . . . . . . . . . . . . .5

1.1.9 Effective Date of This Code . . . . . . .5

1.1.10 Availability of Codes . . . . . . . . . . . . .5

1.1.11 Format . . . . . . . . . . . . . . . . . . . . . . .5

1.1.12 Validity . . . . . . . . . . . . . . . . . . . . . . .5

1.2.0 Building Standards Commission . . .5

1.2.1 BSC . . . . . . . . . . . . . . . . . . . . . . . . .5

1.2.2 BSC-CG . . . . . . . . . . . . . . . . . . . . . .6

1.2.3 Alternative Materials, Design,

and Methods of Construction

and Equipment . . . . . . . . . . . . . . . . .6

1.3.0 Reserved for Board of State and

Community Corrections . . . . . . . . . .7

1.4.0 Department of Consumer Affairs . . .7

1.4.2 Adopting Agency Identification . . . .7

1.5.0 Reserved for California Energy

Commission . . . . . . . . . . . . . . . . . . .7

1.6.0 Reserved for Department of

Food and Agriculture . . . . . . . . . . . .7

1.7.0 California Department of

Public Health . . . . . . . . . . . . . . . . . .7

1.7.2 Adopting Agency Identification . . . .7

1.8.0 Department of Housing and

Community Development [HCD] . . .7

1.8.1 Purpose . . . . . . . . . . . . . . . . . . . . . .7

1.8.2 Authority and Abbreviations . . . . . . .7

1.8.3 Local Enforcing Agency . . . . . . . . . .8

1.8.4 Permits, Fees, Applications,

and Inspections . . . . . . . . . . . . . . . .9

1.8.5 Right of Entry for Enforcement . . . . .9

1.8.6 Local Modification by Ordinance

or Regulation . . . . . . . . . . . . . . . . .10

1.8.7 Alternate Materials, Designs, Tests,

and Methods of Construction . . . . .10

1.8.8 Appeals Board . . . . . . . . . . . . . . . .11

1.8.9 Unsafe Buildings or Structures . . .11

1.8.10 Other Building Regulations . . . . . .12

1.9.0 Division of the State Architect . . . .12

1.9.1 Reserved for the Division of the State

Architect – Access Compliance . . .12

1.9.2 Division of the State Architect –

Structural Safety . . . . . . . . . . . . . . .12

1.10.0 Department of Health Care Access and Information/Office

of Statewide Hospital Planning and Development . . . . . . . . . . . . .13

1.10.1 OSHPD 1 and OSHPD 1R . . . . . . .13

1.10.2 OSHPD 2 . . . . . . . . . . . . . . . . . . . .13

1.10.3 OSHPD 3 . . . . . . . . . . . . . . . . . . . .13

1.10.4 OSHPD 4 . . . . . . . . . . . . . . . . . . . .13

1.10.5 OSHPD 5 . . . . . . . . . . . . . . . . . . . .14

1.10.6 OSHPD 6 . . . . . . . . . . . . . . . . . . . .14

1.11.0 Office of the State Fire Marshal . . .14

1.11.1 SFM – Office of the State

Fire Marshal . . . . . . . . . . . . . . . . . .14

1.11.2 Duties and Powers of the

Enforcing Agency . . . . . . . . . . . . . .16

1.11.3 Construction Documents . . . . . . . .17

1.11.4 Fees . . . . . . . . . . . . . . . . . . . . . . . .18

1.11.5 Inspections . . . . . . . . . . . . . . . . . . .19

1.11.6 Certificate of Occupancy . . . . . . . .19

1.11.7 Temporary Structures and Uses . .19

1.11.8 Service Utilities . . . . . . . . . . . . . . . .19

1.11.9 Stop Work Order . . . . . . . . . . . . . .19

1.11.10 Unsafe Buildings, Structures,

and Equipment . . . . . . . . . . . . . . . .19

1.11.11 Adopting Agency Identification . . .19

1.12.0 Reserved for the State Librarian . .19

1.13.0 Reserved for the Department

of Water Resources . . . . . . . . . . . .19

1.14.0 Reserved for the State Lands

Commission . . . . . . . . . . . . . . . . . .19

CHAPTER 1 DIVISION II

SCOPE AND ADMINISTRATION. . .21

101.0 General. . . . . . . . . . . . . . . . . . . . . . 21

101.1 Title. . . . . . . . . . . . . . . . . . . . . . . . . 21

101.2 Scope . . . . . . . . . . . . . . . . . . . . . . . 21

101.3 Purpose . . . . . . . . . . . . . . . . . . . . . 21

101.4 Unconstitutional . . . . . . . . . . . . . . . 21

TABLE OF CONTENTS

101.5 Validity . . . . . . . . . . . . . . . . . . . . . . 21

102.0 Applicability. . . . . . . . . . . . . . . . . . . 21

102.1 Conflicts Between Codes . . . . . . . . 21

102.2 Existing Installations . . . . . . . . . . . . 21

102.3 Maintenance . . . . . . . . . . . . . . . . . . 21

102.4 Additions, Alterations, Renovations, or Repairs . . . . . . . . . 21

102.5 Health and Safety . . . . . . . . . . . . . . 21

102.6 Changes in Building Occupancy. . . 21

102.7 Moved Structures . . . . . . . . . . . . . . 21

102.8 Appendices. . . . . . . . . . . . . . . . . . . 21

103.0 Duties and Powers of the

Authority Having Jurisdiction . . . . . 22

103.1 General. . . . . . . . . . . . . . . . . . . . . . 22

103.2 Liability . . . . . . . . . . . . . . . . . . . . . . 22

103.3 Applications and Permits . . . . . . . . 22

103.4 Right of Entry . . . . . . . . . . . . . . . . . 22

104.0 Permits . . . . . . . . . . . . . . . . . . . . . . 22

104.1 Permits Required . . . . . . . . . . . . . . 22

104.2 Exempt Work . . . . . . . . . . . . . . . . . 22

104.3 Application for Permit . . . . . . . . . . . 22

104.4 Permit Issuance . . . . . . . . . . . . . . . 23

104.5 Fees . . . . . . . . . . . . . . . . . . . . . . . . 24

105.0 Inspections and Testing . . . . . . . . . 24

105.1 General. . . . . . . . . . . . . . . . . . . . . . 24

105.2 Required Inspections . . . . . . . . . . . 24

105.3 Testing of Systems . . . . . . . . . . . . . 25

105.4 Connection to Service Utilities . . . . 25

106.0 Violations and Penalties . . . . . . . . . 25

106.1 General. . . . . . . . . . . . . . . . . . . . . . 25

106.2 Notices of Correction or Violation . . 25

106.3 Penalties. . . . . . . . . . . . . . . . . . . . . 26

106.4 Stop Orders . . . . . . . . . . . . . . . . . . 26

106.5 Authority to Disconnect Utilities in Emergencies. . . . . . . . . . . . . . . . 26

106.6 Authority to Condemn. . . . . . . . . . . 26

107.0 Board of Appeals . . . . . . . . . . . . . . 26

107.1 General. . . . . . . . . . . . . . . . . . . . . . 26

107.2 Limitations of Authority . . . . . . . . . . 26

Table 104.5 Mechanical Permit Fees . . . . . . . . . 27

CHAPTER 2 DEFINITIONS. . . . . . . . . . . . . . . . . 29

201.0 General. . . . . . . . . . . . . . . . . . . . . . 31

201.1 Applicability. . . . . . . . . . . . . . . . . . . 31

202.0 Definition of Terms . . . . . . . . . . . . . 31

202.1 General. . . . . . . . . . . . . . . . . . . . . . 31

CHAPTER 3 GENERAL REGULATIONS. . . . . . 49

301.0 General. . . . . . . . . . . . . . . . . . . . . . 51

301.1 Applicability. . . . . . . . . . . . . . . . . . . 51

301.2 Approval . . . . . . . . . . . . . . . . . . . . . 51

301.3 Design of Equipment . . . . . . . . . . . 51

301.4 Electrical Connections . . . . . . . . . . 51

301.5 Oil-Burning Appliances . . . . . . . . . . 51

301.6 Personnel Protection . . . . . . . . . . . 51

Heating Systems . . . . . . . . . . . . . . 61

TABLE OF CONTENTS

Schedules . . . . . . . . . . . . . . . . . . . 62

Generators . . . . . . . . . . . . . . . . . . . 62

Safe Temperatures. . . . . . . . . . . . . 62

Table 303.10.1 Reduction of Clearances with

Specified Forms of Protection . . . . 63

Table 313.3 Hangers and Supports . . . . . . . . . . 65

CHAPTER 4 VENTILATION AIR . . . . . . . . . . . . 67

401.0 General. . . . . . . . . . . . . . . . . . . . . . 69

401.1 Applicability. . . . . . . . . . . . . . . . . . . 69

401.2 Indoor Swimming Pools . . . . . . . . . 69

for Health Care Facilities . . . . . . . . 78

and Hoods . . . . . . . . . . . . . . . . . . . 80

Electrical Rooms . . . . . . . . . . . . . . 81

Rooms . . . . . . . . . . . . . . . . . . . . . . 81

TABLE OF CONTENTS

Isolation Rooms and Protective

Environment Rooms . . . . . . . . . . . . 82

Infection Isolation Rooms and

Protective Environment Rooms . . . 82

Ethylene Oxide (ETO) Sterilization Areas. . . . . . . . . . . . . . 82

CHAPTER 16 STATIONARY POWER

PLANTS . . . . . . . . . . . . . . . . . . . . 341

1601.0 Stationary Fuel Cell Power Plants . . . . . . . . . . . . . . . . . . . . . . 343

1601.1 General. . . . . . . . . . . . . . . . . . . . . 343

1602.0 Stationary Gas Engines and Generators and Gas Turbines . . . 343

1602.1 Gas Engines . . . . . . . . . . . . . . . . . 343

Jurisdiction.