Max Appliance Input from Room Volume
Largest appliance BTU input a confined space supports by the standard volume method, before combustion-air openings are required (the inverse of Combustion Air).
Formula and source
Standard volume method solved for input (inverse of combustion-air): max appliance BTU/hr = (room_volume_ft3 / 50) * 1000, since IFGC 2021 §304.5 treats a space as adequate at 50 ft^3 per 1000 BTU/hr.
IFGC 2021 (International Fuel Gas Code) / NFPA 54. §304.
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