Series 45 non-spring return
Damper actuators with NEMA 4 enclosure are rated for 24 VAC power supply, with either on/off-floating or modulating control.

Series 46 spring return
Damper actuators fail to the pre-determined open or closed position. NEMA 4 enclosure are rated for 24 VAC or 120 VAC power supply, with either on/off, floating or modulating control.

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