... adjustable 4.easy to install flow damper,ventilation dampers,louver vents damper vent dampers volume damper duct damper Shaping Mode: plastic ... R, etc (For Reference)Main Software: AutoCAD, UG, CATIA, Solid works, etc Product Name flow damper,ventilation dampers,louver vents damper Item ... room,the frames are packed 10pcs/carton, a poly bag for each frame. Lead Time7-15daysPayment TermsL/C T/TDelivery ...