Grease & kitchen exhaust ducts

Grounded in the retrieved California Mechanical Code — click a citation to read the verbatim passage:

• CMC § 2025 High relevance — show source text

  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.

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  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.

• CMC § 510.1.2 High relevance — show source text

  510.1.2 Interconnection. Duct systems shall not be interconnected with any other building ventilation or exhaust system. [NFPA 96:7.1.3]

  510.1.3 Duct Installation. All ducts shall be installed with a minimum slope of ¼ inch per linear foot (20.8 mm/m) on horizontal runs up to 75 feet (22 860 mm) and a minimum slope of 1 inch per linear foot (83.2 mm/m) on horizontal runs greater than 75 feet (22 860 mm). Factory-built grease ducts shall be permitted to be installed at a lesser slope in accordance with the listing and the manufacturer’s instructions. All horizontal ducts shall be provided with access in accordance with Section 510.3.3.

  Drains shall be provided at low points in horizontal ducts. Where provided, drains shall be continuously welded to the exhaust duct or in accordance with the terms of the listing and the manufacturer’s installation manual.

  All ducts shall be installed without forming dips or traps. In manifold (common duct) systems, the lowest end of the main duct shall be connected flush on the bottom with the branch duct. [NFPA 96:7.1.5 – 7.1.5.5]

  510.1.4 Accessibility. Openings required for accessibility shall comply with Section 510.3 through Section 510.3.2. [NFPA 96:7.1.6]

  510.1.5 Sign. A sign stating the following shall be placed on all access panels:

  ACCESS PANEL – DO NOT OBSTRUCT [NFPA 96:7.1.7]

  510.1.6 Bracing and Supports. Duct bracing and supports shall be of noncombustible material, securely attached to the structure and designed to carry gravity and lateral loads within the stress limitations of the building code. Bolts, screws, rivets, and other mechanical fasteners shall not penetrate duct walls.

  510.1.7 Type I Exhaust Duct Systems. Listed grease ducts shall be installed in accordance with the terms of their listing and the manufacturer’s instructions. [NFPA 96:7.1.8]

  510.1.8 Independent Grease Duct System. Single or combined Type I exhaust systems shall be independent of other exhaust systems.

  510.2 Clearance. Clearance between ducts and combustible materials shall be provided in accordance with the requirements of Section 507.4 through Section 507.4.3.3. [NFPA 96:7.2] 510.3 Openings. Openings shall be provided at the sides or at the top of the duct, whichever is more accessible, and at changes of direction. Openings shall be protected by approved access constructed and installed in accordance with the requirements of Section 510.3.7. [NFPA 96:7.3.1, 7.3.2]

  Exception: Openings shall not be required in portions of the duct that are accessible from the duct entry or discharge.

  [NFPA 96:7.3.3]

  510.3.1 Access Panel. For hoods with dampers in the exhaust or supply collar, an access panel for cleaning and inspection shall be provided in the duct or the hood within 18 inches (457 mm) of the damper. [NFPA 96:7.3.4]

  Exception: Dampers that are accessible from under the hood.

• CMC § 7.7.2.2.4 High relevance — show source text

  Exception: Clearance from the outer surfaces of fieldapplied grease duct enclosures and factory-built grease duct enclosures to the interior surfaces of construction installed around them shall be permitted to be reduced where the field-applied grease duct enclosure materials and factory-built grease duct enclosures are installed in accordance with the conditions of the listing and the manufacturer’s instructions and are acceptable to the Authority Having Jurisdiction. [NFPA 96:7.7.2.2.4] 510.7.4 Mechanical and Structural Integrity. Fieldapplied grease duct enclosures and factory-built grease duct enclosures shall provide mechanical and structural

  integrity, resiliency, and stability when subjected to expected building environmental conditions, duct movement under general operating conditions, and duct movement as a result of interior and exterior fire conditions.

  [NFPA 96:7.7.2.2.5]

  510.7.5 Materials. For field-applied grease duct enclosures and factory-built grease duct enclosures, the materials and products shall be provided in accordance with Section 510.7.5.1 and Section 510.7.5.2.

  510.7.5.1 Protection from Physical Damage. Measures shall be taken to prevent physical damage to any covering or enclosure material. Any damage to the covering or enclosure shall be repaired, and the covering or enclosure shall be restored to meet its intended listing and fire resistance rating and to be acceptable to the Authority Having Jurisdiction.

  [NFPA 96:7.7.3.1, 7.7.3.2]

  510.7.5.2 Inspection. In the event of a fire within a kitchen exhaust system, the duct, the enclosure, and the covering directly applied to the duct shall be inspected by qualified personnel to determine whether the duct, the enclosure, and the covering directly applied to the duct are structurally sound, capable of maintaining their fire protection functions, suitable for continued operation, and acceptable to the Authority Having Jurisdiction. [NFPA 96:7.7.3.3]

  510.7.6 Listed. For listed grease ducts, see Section 510.4.

  510.7.7 Fire Doors. Where openings in the enclosure walls are provided, they shall be protected by listed fire doors of proper rating. Fire doors shall be installed in accordance with NFPA 80. Openings on other listed materials or products shall be clearly identified and labeled according to the terms of the listing and the manufacturer’s instructions and shall be acceptable to the Authority Having Jurisdiction. [NFPA 96:7.7.4.1 – 7.7.4.3] The fire door shall be readily accessible, aligned, and of sufficient size to allow access to the rated access

  panels on the ductwork. [NFPA 96:7.7.4.4]

  510.7.8 Ducts with Enclosure(s). Each duct system shall constitute an individual system serving only exhaust hoods in one fire zone on one floor. Multiple ducts shall not be permitted in a single enclosure unless acceptable to the Authority Having Jurisdiction. [NFPA 96:7.7.5.1 – 7.7.5.2]

  510.8 Underground Installations. Grease ducts installed underground shall be approved for underground installation. The material of the grease duct shall be corrosion-resistant and shall comply with Section 510.5.1.

• CMC § 502.2.4 High relevance — show source text

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  CHAPTER 5

  EXHAUST SYSTEMS

  502.2.4 Commercial Kitchen Ducts. Commercial

  kitchens exhaust ducts shall terminate in accordance with

  Section 510.9 for Type I exhaust systems or Section 519.5 for Type II exhaust systems.

  Part I – Environmental Air Ducts and Product-Conveying Systems.

  503.0 Motors, Fans, and Filters.

  503.1 General. Motors and fans shall be sized to provide the required air movement. Motors in areas that contain flammable vapors or dusts shall be of a type approved for such environments. A manually operated remote control installed at an approved location shall be provided to shut off fans or blowers in flammable vapor or dust systems. Equipment used in operations that generate explosive or flammable vapors, fumes, or dusts shall be interlocked with the ventilation system so that the equipment cannot be operated unless the ventilation fans are in operation. Motors for fans used to convey flammable vapors or dusts shall be located outside the duct or shall be protected with approved shields and dustproofing. Where belts are used, they shall not enter the duct unless the belt and pulley within the duct are enclosed. Motors and fans shall be accessible for servicing and maintenance.

  503.2 Fans. Parts of fans in contact with explosive or flammable vapors, fumes, or dusts shall be of nonferrous or nonsparking materials, or their casing shall be lined or constructed of such material. Where the size and hardness of

  materials passing through a fan are capable of producing a spark, both the fan, and the casing shall be of nonsparking materials. Where fans are required to be spark-resistant, their bearings shall not be within the airstream, and parts of the fan shall be grounded. Fans in systems handling materials that are likely to clog the blades, and fans in buffing or woodworking exhaust systems, shall be of the radial-blade or tube-axial type.

  Equipment used to exhaust explosive or flammable vapors, fumes, or dusts shall bear an identification plate stating the ventilation rate for which the system was designed.

  Fans located in systems conveying corrosives shall be of materials that are resistant to the corrosive or shall be coated

  with corrosion-resistant materials.

  504.0 Environmental Air Ducts.

  504.1 General. Where not specified in this chapter, exhaust ducts shall be constructed and installed in accordance with

  Chapter 6 and shall be airtight as approved by the Authority Having Jurisdiction. Environmental air ducts that have an alternate function as a part of an approved smoke control sys

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  501.0 General.

  501.1 Applicability. This chapter includes requirements for environmental air ducts, product-conveying systems, and commercial hoods and kitchen ventilation. Part I addresses environmental air ducts and product conveying systems. Part II addresses commercial hoods and kitchen ventilation.

  502.0 Termination.

  502.1 Exhaust Opening Protection. Exhaust openings terminating to the outdoors shall be covered with a corrosionresistant screen having not less than [1] ⁄ 4 of an inch (6.4 mm) openings, and shall have not more than [1] ⁄ 2 of an inch (12.7 mm) openings.

• CMC § 2025 High relevance — show source text

  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

  ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  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.

• CMC § 0.024 Medium relevance — show source text

  024 inch (24 gauge) sheet metal over 1 inch glass fiber or mineral wool batts
  reinforced with wire, or equivalent on rear face with at least a 1 inch air gap|66|66| |31⁄2 inch (90 mm) thick masonry wall with at least a 1 inch air gap|66|None| |0.024 inch (24 gauge) sheet metal with at least a 1 inch air gap|66|50| |1⁄2 inch thick noncombustible insulation board with at least a 1 inch air gap|66|50| |0.024 inch (24 gauge) sheet metal with ventilated air space over at least
  0.024 inch (24 gauge) sheet metal with at least a 1 inch air gap|66|50| |1 inch glass fiber or mineral wool batts sandwiched between two sheets of
  0.024 inch (24 gauge) sheet metal with at least a 1 inch air gap|66|50|

  For SI units: 1 inch = 25.4 mm

  • Clearance reduction applied to and covering all combustible surfaces within the distance specified as required clearance with no protection in Table 506.10.4.

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  EXHAUST SYSTEMS

  Part II - Commercial Hoods and Kitchen

  Ventilation.

  507.0 General Requirements.

  507.1 Exhaust Systems. Exhaust systems serving Type I hoods shall comply with Section 507.2 through Section 518.0. Exhaust systems serving Type II hoods shall comply with Section 519.0.

  507.2 Type I Hood Exhaust System Requirements. Cooking equipment used in processes producing smoke or grease-laden vapors shall be equipped with an exhaust system that complies with all the equipment and performance requirements of this chapter. [NFPA 96:4.1.1] All such equipment and its performance shall be maintained in accordance with the requirements of this chapter during all periods of operation of the cooking equipment. [NFPA 96:4.1.2] The following equipment shall be kept in working condition:

  (1) Cooking equipment

  (2) Hoods

  (3) Ducts (if applicable)

  (4) Fans

  (5) Fire-extinguishing equipment

  (6) Special effluent or energy control equipment [NFPA 96:4.1.3]

  Maintenance and repairs shall be performed on all components at intervals necessary to maintain good working conditions. [NFPA 96:4.1.3.1]

  507.2.1 Airflow. All airflows shall be maintained.

  [NFPA 96:4.1.4]

  507.2.2 Responsibility. The responsibility for inspection, testing, maintenance, and cleanliness of the ventilation control and fire protection of the commercial cooking operations, including cooking appliances, shall ultimately be that of the owner of the system, provided that this responsibility has not been transferred in written form to a management company, tenant, or other party.

  [NFPA 96:4.1.5]

  507.2.3 Solid-Fuel Cooking Equipment. All solidfuel cooking equipment shall comply with the requirements of Section 517.0. [NFPA 96:4.1.6]

• CMC § 3.3.34 Medium relevance — show source text

  (3) The air passages of listed self-contained systems.

  Duct, Environmental Air. Ducting used for conveying air at temperatures not exceeding 250°F (121°C) to or from occupied areas of any occupancy through other than heating or air-conditioning systems, such as ventilation for human usage, domestic kitchen range exhaust, bathroom exhaust ducts, locker room exhaust ducts, shower room exhaust ducts, janitor’s closet exhaust ducts, and domestic-type clothes dryer exhaust ducts.

  Duct, Grease. A containment system for the transportation of air and grease vapors that is designed and

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  DEFINITIONS

  Electrical Code. The National Electrical Code promulgated by the National Fire Protection Association, as adopted by this jurisdiction. [HCD 1 & HCD 2] Whenever the term “Electrical Code” is used in this code, it shall mean the Cal- ifornia Electrical Code, Title 24, Part 3.

  Emergency Alarm System. A system intended to provide notification and warning of abnormal conditions and summon appropriate aid.

  Emergency Control Station. An approved location on the premises where signals from emergency equipment are received.

  Enforcing Agency. [HCD 1, HCD 2, SFM, OSHPD 1, 1R, 2, 3, 4, 5 & 6] “Enforcing Agency” is the designated department or agency as specified by statute and regulation.

  Energy Recovery Ventilation (ERV) System. A device intended to provide outdoor ventilation air, and in the process transfer energy between the intake and exhaust airstreams for the purpose of preheating, precooling, humidifying, or dehumidifying outdoor ventilation air prior to supplying such air to a conditioned space.

  Engineering Methods. Design methods that rely on the application of mathematics, sciences, empirical evidence, and engineering principles. [NFPA 54:3.3.34]

  Equipment. A general term including materials, fittings, devices, appliances, and apparatus used as part of or in connection with installations regulated by this code.

  Evaporative Cooler. A device used for reducing the sensible heat of air for cooling by the process of evaporation of water into an airstream.

  Evaporative Cooling System. Equipment intended or installed for the purpose of environmental cooling by an evaporative cooler from which the conditioned air is distributed through ducts or plenums to the conditioned space or zone.

  Evaporator. Part of a refrigeration system in which liquid refrigerant is vaporized to produce refrigeration.

  Excess Flow Valve (EFV). A valve designed to activate when the fuel gas passing through it exceeds a prescribed flow rate. [NFPA 54:3.3.98.3]

  Expansion Tank. A vessel used to protect closed systems from excessive pressure.

  208.0 – F –

  Fabrication Area (Fab Area). An area within a Group H Occupancy semiconductor fabrication facility and related research and development areas in that there are processes involving hazardous production materials. Such areas are allowed to include ancillary rooms or areas such as dressing rooms and offices that are directly related to the fab area

  processes.

• CMC § 403.7.2 Medium relevance — show source text

  ENCLOSED PARKING GARAGES . . . . . . . . . . . . . . 403.7.2

  Alternative Exhaust Ventilation. . . . . . . . . . . . . 403.7.2.1

  Exhaust Systems Operation. . . . . . . . . . . . . . . 403.7.2.4

  Minimum Exhaust Rate . . . . . . . . . . . . . . . . . . 403.7.2.2

  ENCLOSURE OF DUCTS,

  COMMERCIAL KITCHEN EXHAUST

  Clearances . . . . . . . . . . . . . . 507.4.6.3, 507.4.8, 510.7.3

  Continuous. . . . . . . . . . . . . . . . . . . . . . . . . 205.0, 510.7

  Ducts within . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510.7.8

  Fire doors required . . . . . . . . . . . . . . . . . . . . . . . 510.7.7

  Grease, factory built . . . . . . . . . . . . . . . . 208.0, 507.4.4,

  507.4.6, 507.4.6.3

  Grease duct, field-applied. . . . . . . . . . . . 208.0, 507.4.5,

  507.4.6, 507.4.6.3

  Product conveying ducts . . . . . . . . . . . . . . . . . . . . 505.8

  ENCLOSURES

  For equipment on roof. . . . . . . . . . . . . . . . . . . . . . 303.8

  For boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1001.2

  ENERGY STAR, DEFINITION . . . . . . . . . . . . . . . . . . E 201.1

  ENFORCEMENT (SFM) . . . . . . . . . . . . . . . . . . . . . . . 1.11.2.1

  ENFORCING AGENCY

  Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207.0

  SFM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.11.2

  ENGINE, GAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1602.0

  EQUIPMENT

  Clearances. . . . . . . . . 303.10, 303.10.1, Table 303.10.1

  Converted equipment . . . . . . . . . . . . . . . . . . . . . . 902.3

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• CMC § 802.10.4 Medium relevance — show source text

  Connectors. . . . . . . . . . . . . . . 802.10.4, Table 303.10.1,

  Table 802.7.3.3

  Cooking appliances. . . . . . . . 919.4.1, 919.4.2, 919.5.2,

  Draft hoods and controls . . . . . . . . . . . . . . . . . 802.12.6

  Ducts, commercial kitchen

  exhaust . . . . . . . . . . . . . .303.10.1.1, 507.4, 507.4.2.3,

  507.4.6.3, 510.7.3,

  510.9.1, 510.9.2

  Ducts, furnaces. . . . . . . . . . . . . . . . . . . . . . . . . . . 905.2

  Ducts, product conveying,

  exhaust. . . . . . . . . . . . . . . . . . . . . 303.10.1.2, 506.10,

  Equipment on roofs . . . . . . . . . . . . . . . . 303.8, 303.8.4,

  303.8.4.1, 304.2, 304.3.1.1

  Fans, commercial

  kitchen exhaust . . . . . . . . . . . . . . . . . . . . . . . . 510.7.3

  Floor furnace . . . . . . . . . . . . . . . . . . . . . . 906.8, 906.12

  Food service appliances. . . . . . . . . . 917.2, 918.0-918.4

  Furnaces, central heating . . . . . . . . . . 904.3, 904.4.1.2,

  Table 904.3.2

  Gas-fired toilets. . . . . . . . . . . . . . . . . . . . . . . . . . . 928.1

  Gas fireplaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . 912.3

  Grease removal devices,

  commercial kitchen exhaust . . . . . . . . . . 507.4, 507.4.1,

  509.2.2.3

  Hoods . . . . . . . . . . . . . . . . . . 506.10.2, 507.4-507.4.2.3,

  603.13.6

  Illuminating appliances . . . 923.1-923.2.1, Table 923.2.1

  Infrared heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . 925.3

  Kilns . . . . . . . . . . . . . . . . . . . . . . . . . . 603.13.6, 930.5.1

  Listed equipment and appliances . . . . . . . . . . . . . 303.1

  Piping, fuel gas . . . . . . . . . . . . . . . . . . . . . . . . . D 110.1

• CMC § 504.0 Medium relevance — show source text

  Equipment used to exhaust explosive or flammable vapors, fumes, or dusts shall bear an identification plate stating the ventilation rate for which the system was designed.

  Fans located in systems conveying corrosives shall be of materials that are resistant to the corrosive or shall be coated

  with corrosion-resistant materials.

  504.0 Environmental Air Ducts.

  504.1 General. Where not specified in this chapter, exhaust ducts shall be constructed and installed in accordance with

  Chapter 6 and shall be airtight as approved by the Authority Having Jurisdiction. Environmental air ducts that have an alternate function as a part of an approved smoke control sys

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  501.0 General.

  501.1 Applicability. This chapter includes requirements for environmental air ducts, product-conveying systems, and commercial hoods and kitchen ventilation. Part I addresses environmental air ducts and product conveying systems. Part II addresses commercial hoods and kitchen ventilation.

  502.0 Termination.

  502.1 Exhaust Opening Protection. Exhaust openings terminating to the outdoors shall be covered with a corrosionresistant screen having not less than [1] ⁄ 4 of an inch (6.4 mm) openings, and shall have not more than [1] ⁄ 2 of an inch (12.7 mm) openings.

  Exception: Clothes dryers.

  502.2 Termination of Exhaust Ducts. Exhaust ducts shall terminate in accordance with Section 502.2.1 through Section 502.2.4. Classes of air shall be as defined in Section

  203.0 and classified in Section 403.9.

  502.2.1 Environmental, Class 1, and Class 2 Air Ducts. Environmental, Class 1, and Class 2 air duct exhaust shall terminate not less than 3 feet (914 mm) from a property line, 10 feet (3048 mm) above a public way, 3 feet (914 mm) from openings into the building and the minimum separation distance from ventilation system outdoor air intakes determined in accordance with Section 402.4.1. The discharge of dryer exhaust ducts shall not terminate over a public way or over an area where condensate or vapor could create a nuisance or hazard.

  502.2.2 Class 3 Air Ducts. Class 3 air duct exhaust shall terminate not less than 10 feet (3048 mm) from a property line, 3 feet (914 mm) from exterior walls or roofs that are in the direction of the exhaust discharge, 10 feet (3048 mm) from openings into the building, 10 feet (3048 mm) above adjoining grade, and the minimum separation distance from ventilation system outdoor air intakes determined in accordance with Section 402.4.1.

• CMC § 512.1 Medium relevance — show source text

  In ducts, commercial

  kitchen exhaust . . . . . . . . . . . . . . . . . . 512.1, 512.1.1

  In duct furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . 905.7

  Manually operated . . . . . . . . . . . . . . 802.13, E 502.10.2

  Maximum leakage . . . . . . . . . . . . . . . . . . E 503.4.6.4.2

  Motorized, nonrecirculating

  air heating. . . . . . . . . . . . . . . . . . 914.7, E 503.4.6.4.1

  Multiple arrangements . . . . . . . . . . . . . . . . . . . . . 606.7

  Return air . . . . . . . . . . . . . . . . E 503.5.1.3, E 805.5.1.2,

  E 805.5.2, E 805.12.1.1

  Smoke. . . . . . . . . . . . . . . . . . . . . . . 206.0, 606.1, 606.8

  Supply air . . . . . . . . . . . . . E 503.4.6.4.1, E 503.4.6.4.2

  Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1003.4

  Vent . . . . . . . . . . . . . 802.13, 802.14, 802.14.1, C 109.1

  Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206.0

  DECORATIVE

  APPLIANCES, VENTED . . . . . . . . . . . . (see Appliances)

  DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 2

  DEPARTMENT

  Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206.0

  DESIGN

  Requirements for Ethylene Oxide (ETO)

  Sterilization Areas . . . . . . . . . . . . . . . . . . . . . 418.0

  DESIGN FLOOD ELEVATION . . . . . . . . . . . . . . . . . . . 206.0

  DEVICES

  Automatic control . . . . . . . . . . . . . . . . . . . . . . . . . 306.0

  Detection. . . . . . . . . . . . . . . . . . . . . . . . . 206.0, 514.2.3

  Draft control, fuel gas vent . . . . . . . . . . . . . . . . 802.12.2

  Grease removal . . . . . . . . . . . . . . 209.0, 507.4, 507.4.1,

• CMC § 519.5 Medium relevance — show source text

  519.5, 701.11

  Underground. . . . . . . . . . . . . . . . . . . . . . . 510.8, 603.11

  – E –

  ECONOMIZER, AIR . . . . . . . . . . . . . E 503.5.1, E 503.5.1.2,

  Table E 503.5.1.2

  ECONOMIZER, WATER . . . . . . . . . . E 503.5.2, E 503.5.2.1,

  Table E 503.5.2

  ECONOMIZERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407.6

  ELECTRIC HEATING APPLIANCES

  Air conditioners . . . . . . . . . . . . . . . . . . . . . . . . . . . 903.1

  Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0

  Duct heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 905.9

  Room heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 915.2

  ELECTRICAL CODE

  Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207.0

  ENCLOSED PARKING GARAGES . . . . . . . . . . . . . . 403.7.2

  Alternative Exhaust Ventilation. . . . . . . . . . . . . 403.7.2.1

  Exhaust Systems Operation. . . . . . . . . . . . . . . 403.7.2.4

  Minimum Exhaust Rate . . . . . . . . . . . . . . . . . . 403.7.2.2

  ENCLOSURE OF DUCTS,

  COMMERCIAL KITCHEN EXHAUST

  Clearances . . . . . . . . . . . . . . 507.4.6.3, 507.4.8, 510.7.3

  Continuous. . . . . . . . . . . . . . . . . . . . . . . . . 205.0, 510.7

  Ducts within . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510.7.8

  Fire doors required . . . . . . . . . . . . . . . . . . . . . . . 510.7.7

  Grease, factory built . . . . . . . . . . . . . . . . 208.0, 507.4.4,

  507.4.6, 507.4.6.3

  Grease duct, field-applied. . . . . . . . . . . . 208.0, 507.4.5,

  507.4.6, 507.4.6.3