The Carrier M847A1080/U m847-3 60 lb.-in bracket mounted actuator with chain linkage helps mechanical operation systems maintain efficiency and long lasting use. It has spring returns motor shaft to normal position during power outage. Equipped with mounting bracket for wall, duct or direct appliance mounting to control draft damper through an actuator arm or chain linkage arrangement. If you are not sure whether this replacement kit fits your unit, contact us with your model and serial number.