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 Heating equipment clearanceHeating equipment clearance: Clearances: as a general rule heaters must have at least 30 inches clearance in front of them, for their entire height, for servicing. Heaters should have at least 6 inches clearance to combustibles at the front. Clearances at the sides and back are usually dictated by the manufacturer and is specified in the installation manual. Without the installation manual the inspector would not be able to ascertain whether side and rear clearances are acceptable. Vents should be at least 6 inches from combustibles if single-wall and at least 1 inch from combustibles if double-wall. Wall heater face grills should be at least 4 inches from side walls, 16 inches from ceilings or overhangs and 2 1/2 inches from floors. Doors should not open in such a fashion as to allow the door to come within 6 inches of the heater. Floor furnaces should be at least 6 inches from walls. There should be no doors that swing over the furnace, or come within 6 inches of it. Floor furnaces which are set into a "hole" under the building should have at least 6 inches clearance under them. The hole should be dug so that at least 12 inches clearance is provided all the way around the heater except that the burner side should be provided with 1 inches clearance. The draft hood should be kept at least 6 inches from combustibles since it is usually single-wall metal. You are advised to have the hvac system reviewed by a heating and air-conditioning contractor if this item is entered as needing service. Vent system review: Combustion circulated air review: Electric air conditioners
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