Dundas Jafine TD45TC ProFlex Clothes Dryer Transition Duct UL Listed With 2 Tension Clamps, 4-Inch by 5-Foot Ideal for gas and electric dryer applications Constructed of heavy duty, fire resistant, 4 ply aluminum foil laminate that encapsulates a high density, corrosion resistant wire helix Forms an air tight and easy to use air duct Includes 2- 4" tension clamps Duct will not support combustion