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// CODE SNIPPET

703.1.3 Size of Horizontal Openings

NYC Mechanical Code 2008 > 7 Combustion Air > 703 Outdoor Air > 703.1 All Air From the Outdoors > 703.1.3 Size of Horizontal Openings

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The net free area of each opening, calculated in accordance with Section 709 and connected to the outdoors through a horizontal duct, shall be a minimum of 1 square inch per 2,000 Btu/h (1100 mm²/kW) of combined input rating of the fuel-burning appliances drawing combustion and dilution air from the room. The cross-sectional area of the duct shall be equal to or greater than the required size of the opening.

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