General requirements.
NYC Admin. Code § 27-854
in effect§ 27-854 General requirements.
Chimneys or gas vents shall be designed and constructed so as to provide the necessary draft and capacity to completely exhaust the products of combustion to the outside air, and to satisfy the following conditions:
(a) Temperature. The temperature on adjacent combustible surfaces shall not be raised above one hundred sixty degrees Fahrenheit.
(b) Condensation. The condensation shall not be developed to an extent that can cause rapid deterioration of the chimney or vent.
Source: City of New York, Charter, Administrative Code and Rules (American Legal Publishing XML export, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/newyorkcity/latest/NYCadmin/0-0-0-52587Fetched: 10/24/2026
