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8 RSD | 8 Inch Round Motorized Spring Return Damper | EWC Controls Dimensions_1.1 in L 24X10 PVC REDUCING TEE GASKET8 Inch Round Motorized Spring Return Damper Model RSD is a round single blade damper constructed from heavy (24) gauge galvanized steel. The 24 volt motor actuator is direct coupled to the drive shaft. It is a power closed spring open action. (standard). The damper can be field reversed to a power open spring closed action. The RSD has a double layered blade design with an integrated Poron foam gasket to provide a seal when the damper is in the closed