Room Heater Large in Comparison with the Size of the Appliance

A room having a volume equal to at least 12 times the total volume of a furnace and at least 16 times the total volume of a boiler. The total volume of the furnace or boiler is determined from the exterior dimensions and is to include a fan compartment and burner vestibule, where used. Where the actual ceiling height of a room is greater than 2.44 m (8 ft), the volume of the room is to be figured on the basis of a ceiling height of 2.44 m (8 ft).

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