A. 
Refrigerating-machine rooms located in the cellar of any building hereafter erected shall, in the absence of windows to the outer air, be provided with a mechanical ventilating system designed to provide at least minimum per the New York State Mechanical Code. The exhaust discharge of such ventilating systems shall be extended above the roof of the building and in such location as to provide at least code minimum feet clear of any window. All ducts and duct risers which extend into other parts of the premises shall be encased with at least two-inch metal lath and cement plaster or four-inch terra-cotta blocks or code equivalent.
B. 
Refrigerating-machinery rooms shall be provided with at least two means of remote exits and equipped with fireproof, self-closing doors or New York State code minimum.
A. 
Weight limit. No refrigerating system containing more than 20 pounds of refrigerant shall be maintained or operated without a permit issued by the Building Department.
B. 
Flame lights prohibited. No fire, flame or area light will be permitted in a refrigerating machinery room in which an inflammable refrigerant is used.
C. 
Gas mask required. A gas mask of make approved by the United States Bureau of Mines as suitable for the refrigerant used shall be kept in operative condition in an easily accessible case immediately outside the refrigerating room in all plants using 50 pounds or more of an irritant refrigerant.
D. 
Relief-valve requirements.
(1) 
A refrigerating compressor or generator which operates above atmospheric pressure shall be protected by a pressure-relief valve connected into the high-pressure side between the main stop valve and the compressor or generator, to relieve excessive pressure into the low-pressure side of the system.
(2) 
In all refrigerating systems, there shall be a relief valve from the high-pressure side and a relief valve from the low-pressure side, piped to the outside atmosphere so as to discharge not less than 12 feet above the roof or surrounding roofs; the pipe area shall be not less than the combined area of relief-valve outlets and to have the orifice turned downward. When ammonia is used, the discharge from relief valves may be piped into a tank of fresh water used for no other purpose and prevented from freezing without the use of chemicals, containing at least one gallon of water for each pound of ammonia in the system.
E. 
Storage of refrigerant. Refrigerant not contained in the refrigerating system shall be stored only in containers conforming to the regulations described by the Interstate Commerce Commission for the transportation of such refrigerant.
F. 
Warranty; display required. The seller of a refrigerating system shall furnish the purchaser with a sign bearing his name and stating the kind and quantity of refrigerant required for the satisfactory operation of the system, and the purchaser shall conspicuously and permanently display this sign in the machinery room.