The FSD-RD series are UL, ULC and California State Fire Marshal listed as both a UL555 fire and UL555S smoke damper. This True Round damper is available in a 1-1/2 hour fire rating, and with UL555S Class I or Class II leakage ratings and a wide variety of electric and pneumatic actuators
Available in 1-1/2 Hour fire rating, with either UL Class I or Class II leakage.
Available for both vertical and horizontal mount.
Available with 16" (standard), 20" or 24" deep frames/sleeves.
Available with 24VAC, 120VAC or 230VAC electric actuators or Pneumatic actuators
Provided with a resettable heat responsive thermostat (STO/R). Dual thermostat override capable (DTO/R).