Deflecto A048/9 Semi Rigid Flexible Aluminum Duct Non Crimped, 4-Inch by 8-Feet 4" x 8' flexible aluminum duct Perfect for replacing exhaust venting, bathroom vents, clothes dryers vents, range hoods and more Non-Crimped Be sure to clean ducts over time for optimal appliance performance Operating temperature range 0 - 430 degrees fahrenheit