... 3.Durable,adjustable 4.easy to install hvac damper,damper hvac systems hvac duct dampers air damper system damper regulators hvac Shaping Mode: plastic injection Mould Steel: S45C ... )Main Software: AutoCAD, UG, CATIA, Solid works, etc Product Name hvac damper,damper hvac systems Item codeABSG001MaterialPlastic(ABS/HIPS) Colorthe frame is natural, the ...