The URD series of round motorized dampers are a double layered blade design with an integrated NeopreneTM sealing gasket. The superior design insures long life and zero maintenance. URD dampers are easy to install, easy to wire up, and come with a 5 year warranty. The URD damper is constructed of heavy 24 gauge galvanized steel with factory rolled stiffening beads. The nylon bearings and ThermoTuffTM drive shafts insure smooth, quiet operation and provides a thermal barrier to the motor. The URD is designed to operate at static pressures up to 1" w.c. @ < 3% rated cfm leakage. The UL Listed MA-ND5 Actuator is a 24vac 3 wire power open / power close type rated at 18 " lbs. of torque. It includes an integrated terminal block, and NEMA1 rated housing. The MA-ND5 motor features bright Green and Red LED's which correspond to the OPEN and CLOSED position of the blade. The motor also includes End-Stops for Min/Max position capability to allow adjustment of the design CFM flow into a particular zone or area. The Position LED's will illuminate regardless of the End Stop positions.