Drywall : pro tips for hanging and finishing by John D. Wagner
By John D. Wagner
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144 W/m2 . K. a. Reduction of clearances from combustible materials shall not interfere with combustion air, draft hood clearance and relief, and accessibility of servicing. b. All clearances shall be measured from the outer surface ofthe combustible material to the nearest point on the surface ofthe appliance, disregarding any intervening protection applied to the combustible material. c. Spacers and ties shall be of noncombustible material. No spacer or tie shall be used directly opposite an appliance or connector d.
The passageway shall not be less than 30 inches (762 mm) high and 22 inches (559 mm) wide, nor more than 20 feet (6096 mm) in length measured along the centerline of the passageway from the opening to the appliance. A level service space not less than 30 inches (762 mm) deep and 30 inches (762 mm) wide shall be present at the front or service side of the appliance. If the depth of the passageway or the service space exceeds 12 inches (305 mm) below the adjoining grade, the walls of the passageway shall be lined with concrete or masonry extending 4 inches (102 mm) above the adjoining grade and having sufficient lateral-bearing capacity to resist collapse.
Air-conditioning appliances shall have the clearance from supply ducts within 3 feet (914 mm) of the furnace plenum be not less than that specified from the furnace plenum. Clearance is not necessary beyond this distance. 4 Central-heating boilers and furnaces. 6. The clearance to these appliances shall not interfere with combustion air; draft hood clearance and relief; and accessibility for servicing. 1 Appliances installed in rooms that are large in comparison with the size of the appliance. Central-heating furnaces and low-pressure boilers installed in rooms large in comparison with the size of the appliance shall be installed with clearances in accordance with the manufacturer's instructions.