204.0 Baffle Plate. An object placed in or near an

change the direction or retard the flow of air, air-fuel mixtures, or flue gases. Boiler. A closed vessel used for heating water or liquid, or for generating steam or vapor by direct application of heat from combustible fuels or electricity. Boiler, High-Pressure. A boiler for generating steam at gauge pressures in excess of 15 psi (103 kPa), or for heating water to a temperature in excess of 250°F (121°C) or at a gauge pressure in excess of 160 psi (gauge pressure of 1103 kPa).

[NFPA 211:3.3.14.2] Boiler Room. A room where boilers are installed. Bonding Conductor or Jumper. A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected. [NFPA 70:100(I)]

30 2019 CALIFORNIA MECHANICAL CODE

DEFINITIONS

Breathing Zone. The region within an occupiable space between planes 3 inches and 72 inches (76 mm and 1829 mm) above the floor and exceeds 2 feet (610 mm) from the walls or fixed air-conditioning equipment. [ASHRAE 62.1:3] Breathing Zone Outdoor Airflow. The outdoor airflow required in the breathing zone of the occupiable space or spaces in a ventilation zone. [ASHRAE 62.1:6.2.2.1] Breeching. A metal connector for medium- and high-heat appliances. Broiler. A general term including broilers, salamanders, barbecues, and other devices cooking primarily by radiated heat, excepting toasters. [NFPA 54:3.3.15] BTU/H. The listed maximum capacity of any appliance, absorption unit, or burner expressed in British thermal units input per hour, unless otherwise noted. Building. [HCD 1 & HCD 2] Any structure used or intended for supporting or sheltering any use or occupancy. Exceptions: “Building” shall not include the following: (1) Any mobilehome as defined in Health and Safety Code Sec-

tion 18008.

(1) Any mobilehome as defined in Health and Safety Code Sec-

tion 18008. (2) Any manufactured home as defined in Health and Safety

Code Section 18007.

(2) Any manufactured home as defined in Health and Safety

Code Section 18007. (3) Any commercial modular as defined in Health and Safety

Code Section 18001.8 or any special purpose commercial

(3) Any commercial modular as defined in Health and Safety

Code Section 18001.8 or any special purpose commercial modular as defined in Health and Safety Code Section 18012.5. (4) Any recreational vehicle as defined in Health and Safety

Code Section 18010.

(4) Any recreational vehicle as defined in Health and Safety

Code Section 18010. (5) Any multifamily manufactured home, as defined in Health

and Safety Code Section 18008.7.

(5) Any multifamily manufactured home, as defined in Health

and Safety Code Section 18008.7. For additional information, see Health and Safety Code Sec- tion 18908. Building Code. The building code that is adopted by this jurisdiction. [HCD 1, HCD 2, OSHPD 1, 1R, 2, 3, 4 & 5 and SFM] “Building Code” shall mean the California Building Code, Title 24, Part 2. Building Official. See Authority Having Jurisdiction. For applications listed in Section 1.11.0 regulated by the Office of the State Fire Marshal “Building Official” is the officer charged with the administration and enforcement of this code, or a reg- ular deputy. See “Enforcing Agency”. For the State of Califor- nia, “Building Official” shall be the “Enforcing Agency” as specified in Section 1.11.0. Burner, Automatic Boiler. A device to convey fuel into the combustion chamber in proximity to its combustion air supply so as to permit a stable, controlled heat release compatible with the burner design and that is equipped with an ignition system to reliably ignite the entire heat release surface of the burner assembly.

CAS Number.205.0 The Chemical Abstract System registry num- – C – ber.

Ceiling Radiation Damper. A listed device installed in a ceiling membrane of a fire-resistance-rated floor-ceiling or roofceiling assembly to automatically limit the radiative heat transfer through an air inlet/outlet opening. [NFPA 5000:3.3.139.1] Central Heating Plant or Heating Plant. Environmental heating equipment installed in a manner to supply heat by means of ducts or pipes to areas other than the room or space in which the equipment is located. Certified. A formally stated recognition and approval of an acceptable level of competency, acceptable to the Authority Having Jurisdiction. [NFPA 96:3.3.10] Certified Person. A person trained and certified by the equipment manufacturer, or by a recognized organization through a formal certification program for the system to be serviced or cleaned; that is acceptable to the Authority Having Jurisdiction. Chimney. One or more passageways, vertical or nearly so, for conveying flue or vent gases to the outdoors. [NFPA 54:3.3.18] Chimney, Factory-Built. A chimney composed of listed factory-built components assembled in accordance with the manufacturer’s installation instructions to form the completed chimney. [NFPA 54:3.3.18.2] Chimney, Masonry. A field-constructed chimney of solid masonry units, bricks, stones, listed masonry chimney units, or reinforced portland cement concrete, lined with approved chimney flue liners. [NFPA 54:3.3.18.3] Chimney, Metal. A field-constructed chimney of metal.

ssembled in accordance with the manufacturer’s installation instructions to form the completed chimney. [NFPA 54:3.3.18.2] Chimney, Masonry. A field-constructed chimney of solid masonry units, bricks, stones, listed masonry chimney units, or reinforced portland cement concrete, lined with approved chimney flue liners. [NFPA 54:3.3.18.3] Chimney, Metal. A field-constructed chimney of metal.

[NFPA 54:3.3.18.4] Chimney Classifications:Chimney, High-Heat Appliance-Type. A factory built, masonry, or metal chimney suitable for removing the products of combustion from fuel-burning high-heat appliances producing combustion gases in excess of 2000°F (1093°C), measured at the appliance flue outlet. Chimney, Low-Heat Appliance-Type. A factorybuilt, masonry, or metal chimney suitable for removing the products of combustion from fuel-burning low-heat appliances producing combustion gases not in excess of 1000°F (538°C) under normal operating conditions, but capable of producing combustion gases of 1400°F (760°C) during intermittent forced firing for periods up to one hour. All temperatures are measured at the appliance flue outlet. Chimney, Medium-Heat Appliance-Type. A factory-built, masonry, or metal chimney suitable for removing the products of combustion from fuel-burning medium-heat appliances producing combustion gases, not in excess of 2000°F (1093°C), measured at the appliance flue outlet. Chimney, Residential Appliance-Type. A factorybuilt or masonry chimney suitable for removing products of combustion from residential-type appliances producing combustion gases not in excess of 1000°F (538°C), measured at the appliance flue outlet. Factory-built Type HT chimneys have high-temperature thermal shock resistance.

2019 CALIFORNIA MECHANICAL CODE 31

DEFINITIONS any other purpose or distributed to any other persons or parti es.

Chimney Connector. The pipe that connects a fuel-burning appliance to a chimney. [NFPA 211:3.3.48.1] Circulators (Circulating Pump). A device that circulates liquids within a closed circuit for an intended purpose. Classified. See Listed (Third Party Certified). Clean(ing). For kitchen exhaust systems and cooking equipment, the act of removing grease, oil deposits, and other residue. [NFPA 96:3.3.12] Clearly Identified. Capable of being recognized by a person of normal vision without causing uncertainty and indecisiveness about the location or operating process of the identified item. [NFPA 96:3.3.13] Closed Combustible Construction. Combustible building construction, including walls, structural framing, roofs, roof ceilings, floors, and floor-ceiling assemblies, continuously enclosing a grease duct on four sides where one or more sides require protection in accordance with Section 507.4. A heat-producing appliance that employs a combustion cham- Closed Combustion Solid-Fuel-Burning Appliance. ber that has no openings other than the flue collar, fuel-charging door, and adjustable openings provided to control the amount of combustion air that enters the combustion chamber. Closet. See Confined Space. Clothes Dryer. An appliance used to dry wet laundry by means of heat. [NFPA 54:3.3.19] Clothes Dryer, Type 1. Primarily used in family living environment. May or may not be coin-operated for public use.

[NFPA 54:3.3.19.1] Clothes Dryer, Type 2. Used in business with direct intercourse of the function with the public. May or may not be operated by public or hired attendant. May or may not be coin-operated. [NFPA 54:3.3.19.2] Coastal High Hazard Areas. An area within the flood hazard area that is subject to high-velocity wave action, and shown on a Flood Insurance Rate Map or other flood hazard map as Zone V, VO, VE, or V1-30. Code. A standard that is an extensive compilation of provisions covering broad subject matter or that is suitable for adoption into law independently of other codes and standards. Combination Fire and Smoke Damper. A device that meets both the fire damper and smoke damper requirements.

[NFPA 5000:3.3.139.2] Combustible Material. A material that, in the form in which it is used and under the conditions anticipated, will ignite and burn; a material that does not meet the definition of noncombustible. [NFPA 54:3.3.64.1] Combustion Air. The total amount of air provided to the space that contains fuel-burning equipment. Includes air for fuel combustion, draft hood dilution, and ventilation of the equipment enclosure. Combustion Chamber. The portion of an appliance within which combustion occurs. [NFPA 54:3.3.21]

ite and burn; a material that does not meet the definition of noncombustible. [NFPA 54:3.3.64.1] Combustion Air. The total amount of air provided to the space that contains fuel-burning equipment. Includes air for fuel combustion, draft hood dilution, and ventilation of the equipment enclosure. Combustion Chamber. The portion of an appliance within which combustion occurs. [NFPA 54:3.3.21]

Commercial Food Heat-Processing Equipment. Equipment used in a food establishment for heat-processing food or utensils and that produces grease vapors, steam, fumes, smoke, or odors that are required to be removed through a local exhaust ventilation system. Compensating Hood. A hood for commercial food heatprocessing equipment that has an outside-air supply with air delivered below or within the hood. Where makeup air is diffused directly into the exhaust within the hood cavity, it becomes a short-circuit hood. Compressor, Positive Displacement. A compressor in which increase in pressure is attained by changing the internal volume of the compression chamber. Compressor, Refrigerant. A machine, with or without accessories, for compressing a refrigerant vapor. Concealed Spaces. That portion(s) of a building behind walls, over suspended ceilings, in pipe chases, attics, and elsewhere whose size might normally range from 1 ³ ⁄4 inch (44 mm) stud spaces to 8 foot (2438 mm) interstitial truss spaces and that might contain combustible materials such as building structural members, thermal, electrical insulation, or both, and ducting. Such spaces have sometimes been used as HVAC plenum chambers. Condensate. The liquid phase produced by condensation of a particular gas or vapor. Condenser. The part of the system designed to liquefy refrigerant vapor by removal of heat. Condensing Appliance. An appliance that condenses part of the water vapor generated by the burning of hydrogen in fuels. Condensing Unit. A mechanical refrigeration system, consisting of one or more power-driven compressors, condensers, liquid receivers where provided, and the regularly furnished accessories that have been factory assembled and tested prior to its installation. Conditioned Space. An area, room, or space normally occupied and being heated or cooled for human habitation by any equipment. Confined Space. A room or space having a volume less than 50 cubic feet per 1000 British thermal units per hour (Btu/h) (4.83 m ³ /kW) of the aggregate input rating of all fuel-burning appliances installed in that space. Construction Documents. Plans, specifications, written, graphic, and pictorial documents prepared or assembled for describing the design, location, and physical characteristics of the elements of a project necessary for obtaining a permit. Continuous Enclosure. A recognized architectural or mechanical component of a building having a fire resistance rating as required for the structure and whose purpose is to enclose the vapor removal duct for its full length to its termination point outside the structure without any portion of the enclosure having a fire resistance rating less than the required value. [NFPA 96:3.3.22.1] Continuous Pilot. A pilot that burns without turndown throughout the entire period that the boiler is in service, whether or not the main burner is firing.

and whose purpose is to enclose the vapor removal duct for its full length to its termination point outside the structure without any portion of the enclosure having a fire resistance rating less than the required value. [NFPA 96:3.3.22.1] Continuous Pilot. A pilot that burns without turndown throughout the entire period that the boiler is in service, whether or not the main burner is firing.

32 2019 CALIFORNIA MECHANICAL CODE

DEFINITIONS

Continuous Weld. A metal-joining method that produces a product without visible interruption or variation in quality.

[NFPA 96:3.3.15] For the purpose of the definition, it specifically includes the exhaust compartment of hoods and welded joints of exhaust ducts, yet specifically does not include filter support frames or appendages inside hoods. Conversion Burner. A unit consisting of a burner and its controls utilizing gaseous fuel for installation in an appliance originally utilizing another fuel. [NFPA 54:3.3.17.2] Cooling. Air cooling to provide a room or space temperature of 68°F (20°C) or above. Cooling System. All of the equipment, including associated refrigeration, intended or installed for the purpose of cooling air by mechanical means and discharging such air into any room or space. This definition shall not include an evaporative cooler. Cooling Unit. A self-contained refrigeration system that has been factory assembled tested, and installed with or without conditioned air and ducts, without connecting any refrigerant-containing parts. This definition shall not include a portable cooling unit or an absorption unit. Copper Alloy. A homogenous mixture of two or more metals in which copper is the primary component, such as brass and bronze. Crawl Space. In a building, an area accessible by crawling, having a clearance less than human height, for access to plumbing or wiring, storage, etc. CSST. An acronym for corrugated stainless steel tubing.

206.0Damper. A valve or plate for controlling draft or the flow of– D gases, including air. [NFPA 211:3.3.52]

Fire Damper. An automatic-closing metal assembly consisting of one or more louvers, blades, slats, or vanes that closes upon detection of heat so as to restrict the passage of flame and is listed to the applicable recognized standards. Smoke Damper. A damper arranged to seal off airflow automatically through a part of an air duct system so as to restrict the passage of smoke and is listed to the applicable recognized standard. Volume Damper. A device that, when installed, will restrict, retard, or direct the flow of air in any duct, or the products of combustion in any heat-producing equipment, its vent connector, vent, or chimney. Department. [HCD 1 & HCD 2] “Department” means the Department of Housing and Community Development. Design Flood Elevation. The elevation of the “design flood,” including wave height, relative to the datum specified on the community’s legally designated flood hazard map. In areas designated as Zone AO, the design flood elevation is the elevation of the highest existing grade of the building’s perimeter plus the depth number (in feet) specified on the flood hazard map. In areas designated as Zone AO where a depth number is not specified on the map, the depth number is taken as being equal to 2 feet (610 mm).

(2) A tube or conduit wherein the pressure of the air exceeds

1 psi (7 kPa). (3) The air passages of listed self-contained systems. Duct Furnace. A furnace normally installed in distribution ducts of air-conditioning systems to supply warm air for heating. This definition applies only to an appliance that, for air circulation, depends on a blower not furnished as part of the furnace. [NFPA 54:3.3.45.3]

Detection Devices. Electrical, pneumatic, thermal, mechanical, or optical sensing instruments, or subcomponents of such instruments, whose purpose is to cause an automatic action upon the occurrence of some preselected event. [NFPA 96:3.3.17] In the context of this document, the event in question could be excessive temperature or flame, and the action could be the operation of a fire-extinguishing system. Dips. Depression or cup like places in horizontal duct runs in which liquids could accumulate. Heater.Direct Gas-Fired Non-Recirculating Industrial Air A non-recirculating industrial air heater in which all the products of combustion generated by the appliance are released into the outdoor airstream being heated. [NFPA 54:3.3.56.1] An air recirculating heater in which all of the products of Direct Gas-Fired Recirculating Industrial Air Heater. combustion generated by the appliance are released into the airstream being heated. [NFPA 54:3.3.56.2] Direct-Vent Appliances. Appliances that are constructed and installed so that all air for combustion is derived directly from the outdoors and all flue gases are discharged to the outdoors. [NFPA 54:3.3.5.3] Discharge. The final portion of a duct or pipe where the product being conveyed is emptied or released from confinement; the termination point of the pipe or duct. [NFPA 96:3.3.18] Discrete Products in Plenums. Individual, distinct products which are non-continuous such as pipe hangers, duct registers, duct fittings, and duct straps. District Heating Plant. A power boiler plant designed to distribute hot water or steam to users located off the premises. Draft Hood. A nonadjustable device built into an appliance, or made a part of the vent connector from an appliance, that is designed to: (1) Provide for the ready escape of the flue gases from the

appliance in the event of no draft, backdraft, or stoppage

(1) Provide for the ready escape of the flue gases from the

appliance in the event of no draft, backdraft, or stoppage beyond the draft hood. (2) Prevent a backdraft from entering the appliance. (3) Neutralize the effect of stack action of the chimney or

gas vent upon the operation of the appliance. [NFPA

(3) Neutralize the effect of stack action of the chimney or

gas vent upon the operation of the appliance. [NFPA 54:3.3.31] Duct. A tube or conduit for transmission of air, fumes, vapors, or dust. This definition shall not include: (1) A vent, vent connector, or chimney connector. (2) A tube or conduit wherein the pressure of the air exceeds

1 psi (7 kPa).

2019 CALIFORNIA MECHANICAL CODE 33

DEFINITIONS any other purpose or distributed to any other persons or parti es.

Duct System. A continuous passageway for the transmission of air and vapors that, in addition to the containment components themselves, might include duct fittings, dampers, plenums, other items, and air-handling equipment. [NFPA 96:3.3.20] Ductless Mini-Split System. A heating and cooling equipment that includes one or multiple indoor evaporator, air handler, or both units, an outdoor condensing unit that is connected by refrigerant piping, and electrical wiring. A ductless mini-split system is capable of cooling or heating one or more rooms without the use of traditional ductwork. Dwelling. A building or portion thereof that contains not more than two dwelling units. Dwelling Unit. A building or portion thereof that contains living facilities, including provisions for sleeping, eating, cooking, and sanitation, as required by this code, for not more than one family.

Easily Accessible.207.0 See Accessible, Readily. – E – Effective Ground-Fault Current Path. An intentionally constructed, low-impedance electrically conductive path designed and intended to carry current under ground-fault conditions from the point of a ground fault on a wiring system to the electrical supply source and that facilitates the operation of the overcurrent protective device or ground-fault detectors on high-impedance grounded systems. [NFPA 54:3.3.34] Electric Duct Heaters. A heater located in the airstream of a forced-air system where the air-moving unit is not provided as an integral part of the equipment. Electric Heating Appliance. A device that produces heat energy to create a warm environment by the application of electric power to resistance elements, refrigerant compressors, or dissimilar material junctions. 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 the indication 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.1, 1R, 2, 3, 4 & 5] “Enforcing Agency” is the designated [HCD 1, HCD 2, SFM and OSHPD department or agency as specified by statute and regulation. Environmental Air Duct. 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, and domestic-type clothes dryer exhaust ducts.

artment or agency as specified by statute and regulation._ Environmental Air Duct. 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, and domestic-type clothes dryer exhaust ducts.

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 area. 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 54:3.3.99.3]

Fabrication Area (Fab Area).208.0 – F – 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. Factory-Built Grease Duct Enclosures. A listed factory-built grease duct system evaluated as an enclosure system for reduced clearances to combustibles and as an alternative to a duct with its fire-rated enclosure. [NFPA 96:3.3.22.2.1] Family. [HCD 1] “Family” is an individual or two or more persons who are related by blood or marriage, or otherwise, live together in a dwelling unit. Field-Applied Grease Duct Enclosures. A listed system evaluated for reduced clearances to combustibles and as an alternative to a duct with its fire-rated enclosure. [NFPA 96:3.3.22.2.2] Fire Code. Whenever the term “Fire Code” is used in this code, it shall mean the California Fire Code, Title 24, Part 9. Fire Partition. An interior wall or partition of a building that separates two areas and serves to restrict the spread of fire but does not qualify as a fire wall. Fire Resistance Rating. The time, in minutes or hours, that materials or assemblies have withstood a fire exposure as established in accordance with ASTM E119 or UL 263. Fire-Resistive Construction. Construction in accordance with the requirements of the building code for the time period specified. Fire Wall. A wall separating buildings or subdividing a building to prevent the spread of the fire and having a fire resistance rating and structural stability. [NFPA 96:3.3.26] Fireplace Stove. A chimney-connected, solid-fuel-burning stove (appliance) having part of its fire chamber open to the room.

34 2019 CALIFORNIA MECHANICAL CODE

DEFINITIONS

Flammable Vapor or Fumes. The concentration of flammable constituents in air that exceeds 25 percent of its Lower Flammability Limit (LFL). Flood Hazard Area. The greater of the following two areas: (1) The area within a floodplain subject to a 1 percent or

greater chance of flooding in any given year.

(1) The area within a floodplain subject to a 1 percent or

greater chance of flooding in any given year. (2) The area designated as a flood hazard area on a commu nity’s flood hazard map, or otherwise legally designated.

(2) The area designated as a flood hazard area on a commu nity’s flood hazard map, or otherwise legally designated. Floor Furnace. A completely self-contained unit furnace suspended from the floor of the space being heated, taking air for combustion from outside this space. [NFPA 54:3.3.45.5] With means for observing flames and lighting the appliance from such space. Forced-Air Furnace. A furnace equipped with a fan or blower that provides the primary means for circulation of air.

[NFPA 54:3.3.45.6]

Downflow-Type Furnace. A forced-air-type furnace designed with airflow essentially in a vertical path, discharging air at or near the bottom of the furnace. [NFPA 211:3.3.79.2] Enclosed Furnace. A specific heating or heating and ventilating furnace incorporating an integral total enclosure and using only outside air for combustion. Horizontal-Type Furnace. A forced-air-type furnace designed with airflow through the furnace, essentially in a horizontal path. [NFPA 211:3.3.79.3] Upflow-Type Furnace. A forced-air-type furnace designed with airflow essentially in a vertical path, discharging air at or near the top of the furnace. [NFPA 211:3.3.79.5] Fractionation. A change in composition of a blend by preferential evaporation of the more volatile component or condensation of the less volatile component. Fuel Gas. Natural, manufactured, liquefied petroleum, or a mixture of these. Fume Incinerators. Devices utilizing intense heat or fire to break down, oxidize, or both vapors and odors contained in gases or air being exhausted into the atmosphere. [NFPA 96:3.3.27] Furnace, Central. A self-contained appliance for heating air by transfer of heat of combustion through metal to the air and designed to supply heated air through ducts to spaces remote from or adjacent to the appliance location. [NFPA 54:3.3.45.1] Fusible Link. A form of fixed-temperature heat-detecting device sometimes employed to restrain the operation of an electrical or mechanical control until its designed temperature is reached. [NFPA 96:3.3.28] Such devices are to be replaced following each operation. Fusible Plug. A device arranged to relieve pressure by operation of a fusible member at a predetermined temperature.

Galvanized Steel. 209.0 A steel that has been coated with a thin – G – layer of zinc for corrosion protection; conforming to the

requirements of ASTM A653/A653M Standard Specification for Steel Sheet, Zinc-Coat (Galvanized) or Zinc-Iron Alloy- Coat (Galvanized) by the Hot Dip Process . Gas Convenience Outlet. A permanently mounted, handoperated device providing a means for connecting and disconnecting an appliance or an appliance connector to the gas supply piping. The device includes an integral, manually operated gas valve with a nondisplaceable valve member so that disconnection can be accomplished only where the manually operated gas valve is in the closed position. [NFPA 54:3.3.48] Gas Piping. An installation of pipe, valves, or fittings that are used to convey fuel gas, installed on any premises or in a building, but shall not include: (1) A portion of the service piping. (2) An approved piping connection 6 feet (1829 mm) or less

in length between an existing gas outlet and a gas appliance in the same room with the outlet. Gas Piping System. An arrangement of gas piping or regulators after the point of delivery and each arrangement of gas piping serving a building, structure, or premises, whether individually metered or not. Generator. A device equipped with a means of heating used in an absorption system to drive refrigerant out of solution. Gravity Heating System. A heating system consisting of a gravity-type warm air furnace, together with all air ducts or pipes and accessory apparatus installed in connection therewith. Gravity-Type Floor Furnace. A floor furnace depending primarily on circulation of air by gravity. This classification also includes floor furnaces equipped with booster-type fans that do not materially restrict free circulation of air by gravity flow when such fans are not in operation. [NFPA 211:3.3.79.12.2] Grease. Rendered animal fat, vegetable shortening, and other such oily matter used for the purposes of and resulting from cooking, preparing foods, or both. [NFPA 96:3.3.29] Grease might be liberated and entrained with exhaust air or might be visible as a liquid or solid. Grease Ducts. A containment system for the transportation of air and grease vapors that is designed and installed to reduce the possibility of the accumulation of combustible condensation and the occurrence of damage if a fire occurs within the system. [NFPA 96:3.3.20.2] Grease Filter. A removable component of the grease removal system designed to capture grease and direct it to a safe collection point. [NFPA 96:3.3.24.1] Grease Filter, Mesh-Type. A filter construction consisting of a net made from intersecting strands with a space between each strand. [NFPA 96:3.3.24.2] Grease Removal Devices. A system of components designed and intended to process vapors, gases, or air as it is drawn through such devices by collecting the airborne grease particles and concentrating them for further action at some future time, leaving the exiting air with a lower amount of combustible matter.

2019 CALIFORNIA MECHANICAL CODE 35

DEFINITIONS any other purpose or distributed to any other persons or parti es.

Greasetight. Constructed and performing in such a manner as not to permit the passage of grease under normal cooking conditions. [NFPA 96:3.3.31] Grounding Electrode. A conducting object through which a direct connection to earth is established. [NFPA 70:100(I)]

210.0Hazardous Location. An area or space where combustible – H – dust, ignitable fibers, flammable liquids, volatile liquids, gases, vapors, or mixtures are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures. Hazardous Process Piping (HPP). A process material piping or tubing conveying a liquid or gas that has a degreeof-hazard rating in health, flammability, or reactivity of Class 3 or 4, as ranked by the fire code. Health Facilities. [OSHPD 1, 1R, 2, 3, 4 & 5] Buildings specified within the statutory authority of the Office of Statewide Health Planning and Development. Heat Pump. A refrigeration system that extracts heat from one substance and transfers it to another portion of the same substance or to a second substance at a higher temperature for a beneficial purpose. Heat (Energy) Recovery Ventilator. A device intended to remove air from buildings, replace it with outside air, and in the process transfer heat from the warmer to the colder airstreams. Heating Degree Day. A unit, based upon temperature difference and time, used in estimating fuel consumption and specifying nominal annual heating load of a building. For any one day when the mean temperature is less than 65°F (18°C), there exist as many degree days as there is Fahrenheit degrees difference in temperature between mean temperature for the day and 65°F (18°C). Heating Equipment. Includes warm air furnaces, warm air heaters, combustion products vents, heating air-distribution ducts and fans, and all steam and hot water piping, together with all control devices and accessories installed as part of, or in connection with, any environmental heating system or appliance regulated by this code. Heating System. A warm air heating plant consisting of a heat exchanger enclosed in a casing, from which the heated air is distributed through ducts to various rooms and areas. A heating system includes the outside air, return air, and supply air system, and all accessory apparatus and equipment installed in connection therewith. High Limit Control Device. An operating device installed and serving as an integral component of a deep-fat fryer that provides secondary limitation of the grease temperature by automatically disconnecting the thermal energy input when the temperature limit is exceeded. [NFPA 96:3.3.32] High Purity Piping. A form of process piping but is usually specified for critical clean applications in the semiconductor, pharmaceutical, biotechnology, chemical, fiber optics, food, and dairy industries.

deep-fat fryer that provides secondary limitation of the grease temperature by automatically disconnecting the thermal energy input when the temperature limit is exceeded. [NFPA 96:3.3.32] High Purity Piping. A form of process piping but is usually specified for critical clean applications in the semiconductor, pharmaceutical, biotechnology, chemical, fiber optics, food, and dairy industries.

Highside. The parts of a refrigeration system subjected to approximately condenser pressure. Hood. An air-intake device connected to a mechanical exhaust system for collecting and removing grease-laden vapors, fumes, smoke, steam, heat, or odors from commercial food heat-processing equipment.

Fixed Baffle. A listed unitary exhaust hood design where the grease removal device is a nonremovable assembly that contains an integral fire-activated waterwash fire-extinguishing system listed for this purpose.

[NFPA 96:3.3.33.1] Type I. A kitchen hood for collecting and removing grease and smoke. Type II. A general kitchen hood for collecting and removing steam, vapor, heat, or odors. Hot-Water-Heating Boiler. A boiler having a volume exceeding 120 gallons (454 L), a heat input exceeding 200 000 Btu/h (58.6 kW), or an operating temperature exceeding 210°F (99°C) that provides hot water to be used externally to itself. HPM Storage Room. A room used for the storage or dispensing of hazardous production material (HPM) and that is classified as a Group H, Division 1 or Division 2 Occupancy. Hydronics. Of or relating to a heating or cooling system that transfers energy by circulating a fluid through a system of pipes or tubing.

211.0IDLH (Immediately Dangerous to Life and Health).– I – A concentration of airborne contaminant’s, normally expressed in parts per million (ppm) or milligrams per cubic meter (mg/m ³ ), that represents the maximum level from which one is capable of escaping within 30 minutes without escapeimpairing symptoms or irreversible health effects. This level is established by the National Institute of Occupational Safety and Health (NIOSH). Incinerator. An appliance or combustion chamber for the reduction, by burning, of rubbish, garbage, and other wastes.

[NFPA 211:3.3.91] Industrial Heating Equipment. Includes appliances, devices, or equipment used, or intended to be used, in an industrial, manufacturing, or commercial occupancy for applying heat to any material being processed, but shall not include water heaters, boilers, or portable equipment used by artisans in pursuit of a trade. Insanitary Location. An area, space, or room where the air is unfit or undesirable for circulation to occupiable parts of a building. Interconnected. Mutually assembled to another component in such a manner that the operation of one directly affects the other or that the contents of one specific duct system are allowed to encounter or contact the products being moved by another duct system. [NFPA 96:3.3.34] Interlock. A device that senses a limit or off-limit condition or improper sequence of events and shuts down the offending

connected.** Mutually assembled to another component in such a manner that the operation of one directly affects the other or that the contents of one specific duct system are allowed to encounter or contact the products being moved by another duct system. [NFPA 96:3.3.34] Interlock. A device that senses a limit or off-limit condition or improper sequence of events and shuts down the offending

36 2019 CALIFORNIA MECHANICAL CODE

DEFINITIONS

or related piece of equipment or prevents proceeding in an improper sequence in order to prevent a hazardous condition from developing. Intermittent Pilot. A pilot that burns during light-off and while the main burner is firing, and that is shut off with the main burner. Interrupted Pilot. A pilot that burns during light-off and that is shut off during normal operation of the main burner.

Joint, Brazed. 212.0 A joint obtained by joining of metal parts – J – with alloys that melt at temperatures exceeding 840°F (449°C) but less than the melting temperature of the parts being joined. Joint, Compression. A multipiece joint with cup-shaped threaded nuts that, when tightened, compress tapered sleeves so that they form a tight joint on the periphery of the tubing they connect. Joint, Flanged. One made by bolting together a pair of flanged ends. Joint, Flared. A metal-to-metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare. Joint, Mechanical. General form for gastight or liquid-tight joints obtained by the joining of parts through a positive holding mechanical construction. Joint, Press-Connect. A permanent mechanical joint consisting of an elastomeric seal or an elastomeric seal and corrosion-resistant grip ring. The joint is made with a pressing tool and jaw or ring approved by the fitting manufacturer. Joint, Soldered. A joint obtained by the joining of metal parts with metallic mixtures or alloys that melt at a temperature up to and including 840°F (449°C). Joint, Welded. A gastight joint obtained by the joining of metal parts in the plastic molten state.