How much clearance do outdoor combustion air intakes need from combustibles?
How much clearance do outdoor combustion air intakes need from combustibles?
Expert
Maestro
In many jurisdictions, a 2 inch combustible clearance is required for the first 3 feet away from the firebox. In other areas, clearances may have to be greater, up to 9 inches in some cases.
Inadequate clearance means a risk of fire in the home, especially if there is reverse flow and smoke from the fire moves though the duct.
Check what clearances are required in your area if outdoor combustion air intakes are used. Try to get a look at where the combustion air intakes are run. They may be visible from a basement or other subgrade area. In many cases you won't have access.
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