The FSDR25SSM is a "true round" Modulating Class 1 leakage rated combination fire and smoke damper designed for use in metal, wood or concrete fire and smoke rated partitions and concrete floors. The FSDR60 is the ideal choice when round duct is used on a project. The dampers are rated for maximum velocity of 4,000 fpm and 4" static pressure.
- 1 1/2 hour UL555 and Class I UL555S Classified
- UL approval for dual directional air flow. 4,000 fpm and 4” w.g. maximum rating
- Lowest pressure drop over square-to-round construction for energy savings
- Corrosion resistance
