UL 555/555S 1.5 hr./Class I, V-Groove
Blade, 2,000 fpm and 4" w.g. max, Optional Sleeve.
Product Features:
The FSD37SS Combination Fire/Smoke Damper is both UL555 and UL555S Classified. It is
rated as a 1 1/2 hour fire damper and a Leakage Class I Smoke Damper. It features:
Triple V-Groove Blades.
Maximum rating of 2,000 fpm and 4" w.g.
UL approval for dual directional airflow.
Failsafe design, which enables the damper to automatically assume the desired
position when fire or smoke (if smoke detector is present) interrupts
operational power.
Controlled closure in not less than 3 seconds and no more than 15 seconds to
prevent HVAC and duct damage.
Automatic remote reset after test, smoke detection or power failure conditions.
Stainless steel construction.