ProFlex„¢ Dryer Vent Ducting - 25 Feet by Dundas Jafine TD425 The ProFlex„¢ dryer vent duct is ideal for gas and electric 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 air tight and easy to use air duct. This duct will not support combustion. Note: Per UL2158A only ducts 8€™ or less can be UL marked We are a re-seller. We stock the installation and cleaning supplies used by the professionals. Give us a call for all your appliance installation parts and accessories needs.