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When setting an upflow gas furnace on a combustible wood floor, what must the installer verify to comply with the appliance listing and the National Fuel Gas Code?

Any furnace may be set directly on wood with no special provision The furnace is listed for floor mounting or a listed combustible-floor base is used A 1-inch air gap is left under every furnace regardless of listing Combustible-floor installation is never permitted for gas furnaces

Correct Answer:

The furnace is listed for floor mounting or a listed combustible-floor base is used

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