EWC Controls 18X10 ND 18" L X 10" H RSD Motorized Spring Return Damper (Normally Closed)

The ND series of Ultra-Zone dampers was designed with the installer and homeowners 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 ensure quieter operation. This is a feature that homeowners will never hear about! Quieter operation and a longer life motor equals NO call backs. The motor for the ND damper is driven by 18" lbs. of torque, possesses a manual gear release, 3 wire power open/power closed operation and fail-safe LED’s for quick diagnostic checks. The motor is UL listed and NEMA Class 2 certified. The easy access, quick connecting terminal block eliminates the need for wire nuts and allows for trouble free use. The ND damper has a 97% leak proof rating. Overlapping blades and a strong positive shut-off motor ensures accurate control of all zones. The ND dampers combined with an Ultra-Zone zoning system provides the most comfortable and reliable system in the industry. The ND is available in 8" X 6" thru 30" X 30" in even inch increments. The motor will be mounted on the second dimension when ordered. For example, a 16" X 8" damper will have the motor mounted on the 8" dimension, while an 8" X 16" will have the motor mounted on the 16" dimension. This will alleviate the confusion between side mount and bottom mount dampers. For added flexibility, ND dampers can also be provided with a spring return style motor. (Model ND-RSD). The ND-RSD is driven by 3" lbs. of torque without LEDs.

• Heavy Duty extruded 0.80” aluminum construction.
• Glass Filled Nylon Bearings provide quiet operation.
• Overlapping parallel blades for low leakage.
• Power open / Power close function at 35 seconds.
• UL Listed Motor Actuator is rated for 24volt ac/dc.
• 3 wire power open & power close.
• 18”lb / 2Nm torque rating.
• 1 watt (1.5va) power requirement.
• Motor Actuator housing is rated NEMA1.
• End-Stop adjustment allows for a percentage of relief air (leakage) to be set when the damper is powered to the closed position. You may set a maximum open position as well.
• Bright green & red LED’s indicate damper open/closed position, regardless of end stop adjustment.
• Designed to operate at static pressures up to 1.5” wc.
• Available in 6" X 8” thru 30" X 30" in one inch increments. Custom sizing is always available.