// CODE SNIPPET
2311.4 Below-Grade Areas
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Pits and below-grade work areas shall be constructed in accordance with the International Building Code.
Where Class I liquids or LP-gas 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 International Mechanical Code, at a minimum rate of 11/2 cubic feet per minute per square foot (cfm/ft2) [0.008 m3/(s • m2)] to prevent the accumulation of flammable vapors.