This 4 in. x 25 ft. Dryer Vent Duct is ideal for both gas and electric dryer application. It is constructed of heavy-duty， fire resistant， 4-ply aluminum foil laminate that encapsulates a high density， corrosion resistant wire helix. This forms an air tight and easy to use air duct.
Constructed of heavy-duty， fire resistant， aluminum foil laminate
Constructed with a corrosion resistant， wire helix
Duct is airtight
Will not support combustion
Note: per UL2158A only ducts 8 feet or less can be UL marked
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