This backdraft damper is made of , which can withstand use. Features the PVC material, which has high durability, not easy to deform. Fine workmanship, ensures practicality. This backdraft damper will make adjustment easier and smoother. Features -Color:White -Material:PVC -Size:16.00X14.00X12.00cm/6.29X5.50X4.72in - Easy to use and install, 90 degrees to easily adjust the . - Easy to operate, swift, can be directly installed on the air duct. - Used in exhaust fan ducts, clothes dryer ducts, vents and other residential and industrial applications. - There will be a variety of connection methods during the installation of the fresh , ones are the collar connection and the flange connection. - Simple in structure, easy to use, not easy to deform, you can use it with confidence. Package list: 1 damper