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FC § 2311.4.3
Where Class I liquids are stored or used within a building having a basement or pit wherein flammable vapors could accumulate, the basement or pit shall be provided with mechanical ventilation in accordance with the construction codes, including the Mechanical Code, at a minimum rate of 1.5 cubic feet per minute per square foot (0.008 m3/s/m2) to prevent the accumulation of flammable vapors.
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