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NYC Mechanical Code

§ 504.8.1 — § 504.8.1

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What is NYC MC § 504.8.1?

Quick Answer

This section specifies the construction and size requirements for exhaust ducts used in clothes dryers. It mandates that ducts must have a smooth interior finish and be made of metal with a minimum thickness. Applies to building owners installing or maintaining clothes dryer exhaust systems.

General informational summary. Not legal advice for your situation. Consult an attorney before acting on any specific matter.

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504.8.1 Material and size.

MC § 504.8.1

Exhaust ducts shall have a smooth interior finish and shall be constructed of metal a minimum 0.016 inch (0.4 mm) thick. The exhaust duct size shall be 4 inches (101.6 mm) nominal in diameter, unless a larger duct size is specifically required by the dryer manufacturer. Exhaust ducts larger than 20 square inches (12 903.2 mm 2 ) shall be individually exhausted. Exception: Where the make and model of the clothes dryer to be installed is known and the manufacturer's instructions for such dryer are provided, the maximum length of the exhaust duct, including any transition duct, shall be permitted to be in accordance with the dryer manufacturer's instructions.

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