Ductboard Collar with Damper
- 405D
- Equivalent Length 35' and add 0.03 pressure loss device.
- Sizes 5" - 7", 9"; available 24 per box.
- Sizes 8", 10", 12"; available 12 per box.
- Size 14" available 10 per box.
- Size 16" available 8 per box.
- Size 18" available 6 per box.
- Size 20" available 4 per box.