... Software: AutoCAD, UG, CATIA, Solid works, etc Product Name flow damper,ventilation dampers,louver vents damper Item codeABSG001MaterialPlastic(ABS/HIPS ... control the air volume.4. Removable core, four direction air flow , the windows are assembled with each frame, the windows ... than metal grillesPackagethe frames and the adaptors are separated in carton to save the room,the frames are packed 10pcs ...