All multiple dwellings shall comply with the provisions of this article.
Air conditioning systems shall meet the following requirements:
A. 
Refrigerants that are highly flammable shall not be used.
B. 
Direct systems using refrigerants that are flammable or toxic shall not be used for air conditioning purposes.
C. 
Equipment shall be secured so as not to present a hazard.
A. 
Ventilating systems shall be installed and maintained so that the rapid spread of heat, flame or smoke through the system will be prevented and so that under conditions of use the temperature of any combustible material adjacent thereto or in contact therewith will not exceed a safe temperature.
B. 
Stairways, shafts, hoistways or attics shall not be used as plenum chambers.
C. 
Ducts shall be securely fastened in place and appropriately fire-stopped.
D. 
Filters shall be installed and maintained so as not to constitute a fire or smoke hazard.
E. 
Ducts passing through or located within combustible construction shall be separated from such construction by a clearance of at least 1/2 inch or by a noncombustible insulating material at least 1/4 inch thick.
F. 
Air required for ventilation shall be taken from the exterior or shall be quality controlled.
G. 
Exhaust air from a dwelling unit or a space the contents of which may emit odors, fumes or vapors shall not be circulated to other occupied spaces within the building.
H. 
Enclosures or spaces where heat, gases, vapors or odors may accumulate and become a potential source of hazard or nuisance shall be provided with adequate means of ventilation to remove such excess.
A. 
Air intake and exhaust openings shall be installed, located and maintained so as not to constitute a hazard or nuisance, so as to prevent the possibility of fire, smoke, fumes or foreign matter being drawn into the system.
B. 
Ventilating systems shall be provided with adequate openings for incoming and outgoing air to obtain the required circulation. Intake openings shall provide air from an uncontaminated source.
C. 
Where openings for mechanical exhaust are located in spaces that also contain fuel-burning equipment, there shall be provided fixed intake openings from the exterior to supply sufficient air so that the fuel-burning equipment is not adversely affected.
D. 
Exhaust openings shall be located so that the exhaust air will not create a nuisance.
A. 
Manually operated controls shall be provided to stop the operation of all central fan equipment. Such controls shall be conspicuously identified and in readily accessible location outside the fan room.
B. 
Every system using recirculated air and serving an assembly space or more than one fire area or more than one story of a building, shall be provided with controls arranged so that under abnormal rise in temperature of the air in the system the fans causing normal circulation shall stop and require manual restart.
C. 
Every system for ventilating an assembly space shall be provided with an emergency switch conveniently located and with a durable sign giving instructions for shutting down the system in case of fire.