Model 151B Fire Damper
- Designed with constant force springs in the horizontal configurations to ensure closure under airflow conditions.
- Meets all UL and NFPA requirements for Primary Fire Dampers, and carries a UL555 classified fire damper label.
- Approved for use where ducts penetrate partitions with fire resistance ratings of two hours or less.
- 1 1/2 hour rating for use in fire barriers rated two hours or less.
- Optional installed duct sleeves available.