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904.2.9 Central Heating Furnaces
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Central heating furnaces other than those listed in Section 904.2.7 or Section 904.2.8 shall have clearances from the supply ducts of not less than 18 inches (457 mm) from the furnace plenum for the first 3 feet (914 mm), then 6 inches (152 mm) for the next 3 feet (914 mm) and 1 inch (25.4 mm) beyond 6 feet (1829 mm). [NFPA 54:10.3.2.9]
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