Active Air Backdraft Damper, 4 (ACBD4)Made of galvanized steel, these dampers prevent air leakage into your fan setup. They are easy to install, fit directly onto the ducting, and prevent a back draft of air when the fans are switched off.
 | Manufacturer's Product Information |  | | MSRP each $ | 17.95 | UPC | 638104007818 | Dimensions | 6.6 x 4.1 x 6.8 | Case Weight | 10 | Case Quantity | 20 | | — Ships from HF: OR, CA, CO, PA, TX, FL USA. |