The #501S Ductboard Starting Collar w/Holes and Sealed Flange on inside are available in 12 sizes from 4" through 20".
| M&M Manufacturing Co. | |
|---|---|
| Product Category | HVAC Ductwork |
| Product Number | 501S9 |
| Product Name | #501S Metal Tabbed Ductboard Starting Collar w/Holes & Sealed Inside Flange |
| Application | Commercial |