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Section 406 Ventilation of Uninhabited Spaces
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Uninhabited spaces, such as crawl spaces and attics, shall be provided with natural ventilation openings as required by the International Building Code or shall be provided with a mechanical exhaust and supply air system. The mechanical exhaust rate shall be not less than 0.02 cfm per square foot (0.00001 m3/s • m2) of horizontal area and shall be automatically controlled to operate when the relative humidity in the space served exceeds 60 percent.
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Uninhabited spaces, such as crawl spaces and attics, shall be provided with natural ventilation openings as required by the International Building ...
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Mechanical Code 2018 of Maryland > 3 General Regulations > 307 Condensate Disposal > 307.3 Condensate Pumps
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1,500 square feet (140 m 2 ) of under-floor space area. One such ventilating opening shall be within 3 feet (914 mm) of each corner of the building ...