If your laundry room features an oval in-wall duct, the Imperial 4-in Round to Oval Adapter Elbow will help you easily connect your dyer to the exhaust air duct system. This duct adapter allows for easy connection of an oval in-wall duct to a 4-in round dryer transition duct for safe and effective venting. Made from a high temperature-resistant polymer, this adapter elbow can withstand the heat produced by your dryer to help keep your home safe from potential hazards. The dryer duct can be easily removed from this adapter for cleaning when required.