M&M Spin-In Starting Collar With Scoop and Damper, 504 Series, 8 in Fitting, Crimp Connection, Metal, Finish: Galvanized, 5-1/2 in Height, 28 ga Gauge
| Connection Type | Crimp |
| Height | 5-1/2 in |
| Model | 504MSD |
| Series | 504 Series |
| Duct Size | 8 in |
| Vent Duct Shape | Round |
| Gauge | 28 ga |
| Material | Metal |
| Finish | Galvanized |
- Damper with steel hardware and locking handle
- 4 in WC positive pressure
- Commercial SMACNA gauge material