| PRL |
 |
Extruded Aluminum Construction, Single Thickness
Blades, Automatic Operation Backdraft Damper |
| PR50 |
|
Extruded Aluminum Round Backdraft Damper |
| PR51/52/53 |
|
Extruded Aluminum, Galvanized Steel, or Stainless
Steel Round Backdraft Damper |
|
PR55 |
|
Aluminum Frame, Single Thickness Aluminum Blade,
Backdraft Damper |
|
PR66 |
|
Steel Frame, Single Thickness Steel Blade, Backdraft Damper |
| PRI4 |
|
Galvanized Steel Frame, Steel Tear Drop Design Blade, Backdraft Damper |
| PRI9 |
|
Galvanized Steel Frame, Steel Tear Drop Design
Blade, Backdraft Damper |
