| Backdraft damper, vertical mount, Model WD-320, 14 In Sq, Flange on Discharge, Performance up to 2,500 ft/min | $181.00 | | |
| Backdraft damper, vertical mount, Model WD-320, 16 In Sq, Flange on Discharge, Performance up to 2,500 ft/min | $172.00 | | |
| Backdraft damper, vertical mount, Model WD-320, 18 In Sq, Flange on Discharge, Performance up to 2,500 ft/min | $181.00 | | |
| Backdraft damper, vertical mount, Model WD-320, 20 In Sq, Flange on Discharge | $188.00 | | |
| Backdraft damper, vertical mount, Model WD-320, 22 In Sq, Flange on Discharge | $199.00 | | |
| Backdraft damper, vertical mount, Model WD-320, 26 In Sq, Flange on Discharge | $239.00 | | |