The SD60 is a UL555S Classified Leakage Class I smoke damper. It features:
UL555S Class I.
Rated to 2,000 fpm and 4" w.g.
With factory furnished actuator, provides fail-safe operation (the damper automatically goes to the desired fail-safe position when fire interrupts power.)
Available with factory furnished sleeves.
Airfoil blades, which have greater strength, less static pressure, superior sealing, superior fire protection, and produce less noise