... 4 way air flow 3.Durable,adjustable 4.easy to install flow damper,ventilation dampers,louver vents damper vent dampers volume damper duct ... AutoCAD, UG, CATIA, Solid works, etc Product Name flow damper,ventilation dampers,louver vents damper Item codeABSG001MaterialPlastic(ABS/HIPS ... register to further control the air volume.4. Removable core, four direction air flow , the windows are assembled with ...