FDR25 UL Classified 1 1/2 hr. Dynamic, True Round

The FDR25 is a UL555 Classified 1-1/2 Hour rated Round Fire Damper. It features:

Retaining cinch plates and extended duct connections for adjustable installation.
Low pressure drop.
Vertical and horizontal closure spring operation for assured closure under air flow (fans on) in HVAC systems.
Galvanized steel construction

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UL 555 1.5 hr. Dynamic, True Round, 2,000 fpm and 4" w.g. max, Integral Frame/Sleeve
- Retaining cinch plates and extended duct connections for adjustable installation.
- Low pressure drop.
- Vertical and horizontal closure spring operation for assured closure under air flow (fans on) in HVAC systems.
- Galvanized steel construction