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705.1.1 Openings and Supply Ducts
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Openings shall be provided, located and sized in accordance with Sections 702.3.1 and 702.3.2; additionally, there shall be one opening to the outdoors having a free area of at least 1 square inch per 5,000 Btu/h (440 mm2/kW) of total input of all appliances in the space.
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