• The ND damper is constructed using heavy-duty 0.8 in extruded aluminum Nylon bearings for quiet operation Overlapping parallel blade design Reliable operation up to 1.5 in-WC and 1500 fpm duct velocities The UL Listed motor actuator 24 VAC 3-wire power open/power close or floating function The motor actuator is rated at 18 in-lb of torque, superior to low torque spring-type motors The motor actuator housing is rated NEMA 1 Integrated end stop adjustment allows a percentage of relief air (leakage) when the damper is powered closed You may set a maximum open position as well, which is useful during test and balancing procedures Bright green and red LED's indicate damper open and closed position

The ND Series of ultra-zone dampers was designed with the installer and homeowner in mind. This damper is easy-to-install and easy to checkout. The LED display allows the installer to visually check the damper operation. With a sturdier frame, the damper installs in the duct much faster and easier and the nylon bushings insure quieter operation. This is a feature that homeowners will never hear about quieter operation and a longer life motor equals NO call backs.