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502.4.5 Outdoor Air Intakes and Exhaust Openings
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Stair and elevator shaft vents and other outdoor air intakes and exhaust openings integral to the building envelope shall be equipped with not less than a Class I motorized, leakage-rated damper with a maximum leakage rate of 4 cfm per square foot (6.8 L/s • C m2) at 1.0 inch water gauge (w.g.) (1250 Pa) when tested in accordance with AMCA 500D.
Exception: Gravity (nonmotorized) dampers are permitted to be used in buildings less than three stories in height above grade.
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