Manufacturer Name: ZoneFirst Product Number: MSS OEM Part Number: MSS The ZoneFirst MSS Silent Spring Return Motor is a quiet and reliable solution for controlling air dampers in HVAC systems. This 24-volt AC motor operates silently using a synchronous hysteresis design, minimizing noise during operation. It features a spring-return mechanism that automatically opens the damper w... https://www.partshnc.com/mss-zonefirst-24v-motor-silent-spring-return