Features:
- UL555S Class I.
- Rated to 4,000 fpm and 4" w.g.
- Extremely tight shut-off.
- Stops the passage of smoke in static and dynamic smoke systems.
- Easy installation.
- Readily connects to round spiral or flexible ductwork.
The MDRS25 is a ruggedly built round manual balancing damper with factory mounted, locking hand quadrant designed especially for manual balancing applications within round spiral ductwork.