The FSDR25 Round Butterfly Combination Fire/Smoke damper is both UL555 classifed and UL555S classified.
It features:
- 1 1/2 hour UL555 and Class I UL555S Classified
- UL approval for dual directional air flow
- Fail-safe design, which enables the damper to automatically assume the desired position when fire or smoke (if smoke detector present) interrupts operational power
- 3,000 fpm and 4” w.g. maximum rating
- Low pressure drop
- Galvanized steel construction