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.
- Low pressure drop.
- Galvanized steel construction.
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