The ProFlex™ dryer duct is ideal for both gas and electric clothes dryer applications. This duct is UL2158A listed and marked for safe dryer venting and is constructed of heavy-duty, fire-resistant, 4-ply aluminum foil laminate that encapsulates a high density, corrosion-resistant wire helix. This forms an airtight and easy-to-use air duct. This duct will not support combustion.