| 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 | | |
| Backdraft damper, vertical mount, Model WD-330, 24 In Sq, No Flange, Performance up to 2,500 ft/min | $242.00 | | |
| Backdraft damper, vertical mount, Model WD-330, 35 In Sq, No Flange, Performance up to 2,500 ft/min | $304.00 | | |
| Backdraft damper, vertical mount, Model WD-330, 8 In Sq, No Flange, Performance up to 2,500 ft/min | $126.00 | | |