Combination Smoke and Fire Damper FSDR25 - Class I, True Round

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

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