| 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 | | |
| Backdraft damper, vertical mount, Model WD-320, 32 In Sq, Flange on Discharge | $333.00 | | |
| Backdraft damper, vertical mount, Model WD-320, 38 In Sq, Flange on Discharge | $420.00 | | |
| Backdraft damper, vertical mount, Model WD-330, 10 In Sq, No Flange, Performance up to 2,500 ft/min | $136.00 | | |
| Backdraft damper, vertical mount, Model WD-330, 12 In Sq, No Flange, Performance up to 2,500 ft/min | $136.00 | | |
| Backdraft damper, vertical mount, Model WD-330, 14 In Sq, No Flange, Performance up to 2,500 ft/min | $161.00 | | |
| Backdraft damper, vertical mount, Model WD-330, 16 In Sq, No Flange, Performance up to 2,500 ft/min | $161.00 | | |
| Backdraft damper, vertical mount, Model WD-330, 18 In Sq, No Flange, Performance up to 2,500 ft/min | $186.00 | | |
| Backdraft damper, vertical mount, Model WD-330, 20 In Sq, No Flange, Performance up to 2,500 ft/min | $197.00 | | |
| Backdraft damper, vertical mount, Model WD-330, 23 In Sq, No Flange, Performance up to 2,500 ft/min | $231.00 | | |
