N.Y.C. Admin. Code § 27-881: § 27-881 Draft hoods.

(a) All vented equipment, except dual oven type combination ranges, equipment with sealed combustion chambers, and units designed for power burners or forced venting, shall be installed with a draft hood or with a barometric damper.

(b) The draft hood supplied with, or forming a part of, vented equipment shall be installed in accordance with the requirements of the applicable standard in reference standard 15-2. The draft hood shall be located in the same room as the combustion air opening of the equipment.