Sufficient fresh air shall be provided to the heat generating apparatus to allow complete combustion of fuel at all firing rates. For gas- or oil-fired burners, the boiler room shall have at least one square foot of opening for the entry of fresh air for every 2,000,000 Btu of fuel burned per hour.
N.Y. Comp. Codes R. & Regs. Tit. 12 §§ 4-7.3