x 25 ft.
Constructed of heavy-duty, fire resistant, aluminum foil laminateConstructed with a corrosion resistant, wire helixDuct is airtightWill not support combustionNote: per UL2158A only ducts 8 feet or less can be UL marked Dryer Vent Duct is ideal for both gas and electric dryer application. Flexible Foil Duct 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. This 4 in.