* Use FSNF series if damper is > 4 sq.ft.
** Use -S model of proper voltage.
Nominal sq.ft. per UL555S testing. Temp Actuator
<4 350°F FSLF 36” w x 24” h also.
The FSTF series actuators were introduced in 2013. They are 18 in-lb and designed for under 1.5 sq.ft. of
fire and smoke damper. Use on larger dampers only when replacing an existing FSTF on a fire and smoke
damper.
The FSLF is recommended for small dampers.
Belimo actuators pass
UL555S at the same damper
sizes as the Honeywell.
NOTE. Although an actuator may operate a larger sized damper
use the UL listed sizing. Call for assistance.
Air Balance Honeywell ML&MS Types to Belimo FSxx March 2018
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