According to the UMC, any unlisted commercial type boiler, hot water heater, or furnace shall have a minimum clearance at the back and sides of the appliance of not less than _____ inches unless a form of protection specified in the cod e is used.

According to the UMC, any unlisted commercial type boiler, hot water heater, or furnace shall have a minimum clearance at the back and sides of the appliance of not less than _____ inches unless a form of protection specified in the cod e is used.