| 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 | | |