810.3 Smoke test.

To determine the tightness of chimney construction, a smoke test shall be made in accordance with the following conditions and requirements:

   1.   The equipment, materials, power and labor necessary for such test shall be furnished by, and at the expense of, the owner or holder of the work permit.

   2.   If the test shows any evidence of leakage or other defects, such defects shall be corrected in accordance with the requirements of this chapter, and the test shall be repeated until the results are satisfactory.

   3.   The chimney shall be filled with a thick penetrating smoke produced by one or more smoke machines, or smoke bombs, or other equivalent method. As the smoke appears at the stack opening on the roof, such opening shall be tightly closed and a pressure equivalent to 1/2- inch (13 mm) column of water measured at the base of the stack, shall be applied. The test shall be applied for a length of time sufficient to permit the inspection of the chimney.

   4.   Refer to Section 1704.32 of the New York City Building Code for requirements for existing and new negative pressure chimneys and vents.

Section MC 811: Exhaust Gases from Internal Combustion Engines and Turbines

811.1 Exhaust system construction.

The exhaust system from internal combustion engines shall be constructed in accordance with NFPA 211, NFPA 37, and based on the temperature of the flue gas entering the exhaust system, and in accordance with the following:

   1.   The exhaust system, if factory built, shall be installed in accordance with its listing and manufacturer's instructions.

      1.1.   Exhaust systems with flue gas temperatures greater than 300°F (148.9°C) shall be listed to UL 103 or UL 2561 and be rated for a minimum of 60 inch w.c. (14 934.3 Pa).

      1.2.   Exhaust systems with flue gas temperatures not more than 300°F (148.9°C) and that are capable of causing excessive condensate production in the exhaust system shall be listed to UL 103 or UL 2561 and UL 1738 and be rated for a pressure suitable for the operating conditions.

   2.   The exhaust system, if field fabricated, shall be constructed of at least 3/16-inch (4.8 mm) steel, or of other equivalent metal of similar strength and resistance to the temperature and corrosive action of the exhaust gases. No lining shall be required.

   3.   Where the exhaust system runs inside a building, it shall be insulated adequately for the equipment operating temperature, so that the surface temperature shall be not more than 200°F (93.3°C).

   4.   Where the exhaust system runs inside a building outside of the room containing the equipment, it shall be enclosed in fire-rated construction with a fire rating equal to the fire rating of the construction of the room.

   5.   All joints shall be constructed so as to be gas tight under all operating conditions and tested in accordance with Section 810.