The SDRS25 is a UL555S Classified 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 leakage of smoke in static and dynamic smoke systems.
- Easy installation.
- Readily connects to round spiral or flexible ductwork.
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