The SDRS25SS is a UL555S Classified 304 or 316 stainless steel round smoke damper. It is Leakage Class I classified and 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.