... Software: AutoCAD, UG, CATIA, Solid works, etc Product Name flow damper,ventilation dampers,louver vents damper Item codeABSG001MaterialPlastic(ABS/HIPS ... two levels of deflection blade sets perpendicular to each other,vertical blade set at the front and horizontal blade set at ... control the air volume.4. Removable core, four direction air flow , the windows are assembled with each frame, the windows ...