... HIPS 2.Removable core,4 way air flow 3.Durable,adjustable 4.easy to install flow damper,ventilation dampers,louver vents damper ... Software: AutoCAD, UG, CATIA, Solid works, etc Product Name flow damper,ventilation dampers,louver vents damper Item codeABSG001MaterialPlastic(ABS/HIPS ... the back. 2. The deflection blade sets can be adjustable manually.3. The optional volume control damper can be added ...