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The effective venting area shall be not less than 31/2 percent of the maximum shaft area at any floor, but in no event less than 72 square inches (46 451.5 mm2).

Related Code Sections

910.5.2 Fire Protection Systems, Smoke Vent Dimensions
The effective venting area shall not be less than 3-1/2 percent of the maximum shaft area at any floor, but in no event less than 72 square inches ...
910.3.3 Fire Protection Systems, Vent Dimensions
The effective venting area shall not be less than 16 square feet (1.5 m2) with no dimension less than 4 feet (1219 mm), excluding ribs or gutters ...
503.4.2.5 Chimneys and Vents, Smoke Test
To determine the tightness of vent construction, a smoke test shall be conducted in accordance with the following conditions and requirements: The ...