Belimo FSNF120-FC Actuator 321894-708 a different regulator spring or

a different regulator spring or valve assembly is required

You will simply have an additional speed tap available for more granular airflow adjustment

ensure your lead wiring and voltage taps match the nameplate data to optimize motor longevity and prevent premature winding failure common with generic alternatives

it requires a bipolar stepper motor controller to drive the motor based on pressure or temperature inputs

Belimo FSNF120-FC Actuator 321894-708 a different regulator spring orThe Belimo FSNF120 FC Actuator is a dedicated 120V fire and smoke damper actuator designed for fail safe operation in life safety applications. Engineered for two position control, this motor provides 36 in lb of torque to reliably drive dampers to the open position, with a heavy duty spring return mechanism ensuring immediate closure upon power loss or smoke detection. Built to meet UL555S standards, it operates effectively at elevated temperatures