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Supply air ducts connecting to listed central heating furnaces shall have the same minimum clearance to combustibles as required for the furnace supply plenum for a distance of not less than 3 feet (914 mm) from the supply plenum. Clearance shall not be required beyond the 3 feet (914 mm) distance. [NFPA 54:10.3.2.7]

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G2409.4 Fuel Gas, (308.4) Central Heating Boilers and Furnaces
Supply air ducts connecting to listed central heating furnaces shall have the same minimum clearance to combustibles as required ...
904.2 Installation of Specific Appliances, Clearance
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