204.0 – B –

Baffle Plate. An object placed in or near an appliance to 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

30 2022 CALIFORNIA MECHANICAL CODE

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)] 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. (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 modular as defined in Health and Safety Code Section 18012.5. (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. 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.

DEFINITIONS