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1092 Combustion Air Duct Clearances - Heating - Wood Burning Fireplaces
1092 Combustion Air Duct Clearances - Heating - Wood Burning Fireplaces -

Image Text: Cross section through chimney > in many areas, the combustion air duct requires 2 inches of clearance from combustibles for the first 3 feet away from the firebox > beyond that, the clearance is typically 1 inch > floor joist > chimney > firebox > air inlet > first 3 feet > exterior wall > wall framing > floor joist > combustion air > insulation > outdoor air intake

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