The #507D Starting Collar w/Damper for 1" or 1½" Ductboard is available in 12 sizes from 4" through 20".
| M&M Manufacturing Co. | |
|---|---|
| Product Category | HVAC Ductwork |
| Product Number | 507D9 |
| Product Name | #507D Metal Starting Collar w/Damper for 1" or 1½" Ductboard |
| Application | Commercial |
