![]() ![]() ![]() Combining spaces in different stories.The minimum dimension of air openings shall not be less than 3 inches (76 mm). One permanent opening shall commence within 12 inches (305 mm) of the top of the enclosure and one permanent opening shall commence within 12 inches (305 mm) of the bottom of the enclosure (see Figure 701.5). Each opening shall have a minimum free area of 1 square inch per 1000 Btu/h (0.002 m 2/kW) of the total input rating of all appliances in the space, but not less than 100 square inches (0.065 m 2). Openings used to connect indoor spaces shall be sized and located in accordance with the following:
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