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NYC Mechanical Code

§ 701.4.2 — § 701.4.2

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What is NYC MC § 701.4.2?

Quick Answer

This section outlines requirements for attic space used to obtain combustion air, specifying that ventilation openings must be free from ice or snow blockage and that the attic must have a minimum vertical clear height of 30 inches. It mandates proper materials for combustion air openings. Applies to building owners with attic spaces utilized for combustion appliances.

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

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701.4.2 Attic space.

MC § 701.4.2

Where combustion air is obtained from an attic area, the attic ventilating openings shall not be subject to ice or snow blockage, and the attic shall have not less than 30 inches (762 mm) vertical clear height at its maximum point. Attic ventilation openings shall be sufficient to provide the required volume of combustion air and the attic ventilation required by the New York City Building Code. The combustion air openings shall be provided with a sleeve of not less than 0.019 inch (0.48 mm) (No.26 Gage) galvanized steel or other approved material extending from the appliance enclosure to at least 6 inches (152.4 mm) above the top of the ceiling joists and insulation.

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