Ewc Controls 8x16 Nd-rsd No Spring Return Damper

Product Description

The EWC CONTROLS 8x16 nd-rsd no is a motorized spring return zone damper built for rectangular HVAC ductwork. Sized at 16 x 8 inches, this normally open damper uses a 24-volt, 2-wire spring return motor mounted to the side of the frame to control airflow in zoned residential air distribution systems. The ND series frame is constructed for faster duct installation, and nylon bushings reduce operational noise for quieter system performance. This damper is installed by licensed HVAC technicians as part of a zone control system and is well suited for applications where fail-open operation is required on loss of power.

The 8x16 nd-rsd no is designed for rectangular duct zone control in residential and light commercial HVAC zoning applications where air quality and balanced airflow distribution are priorities. The normally open position ensures airflow is maintained through the zone if power or signal is lost, which is a common requirement in single-zone or multi-zone forced-air systems. Its side-mounted motor keeps the motor accessible after installation without requiring duct removal. This damper is part of EWC CONTROLS ND series, engineered specifically for zoning systems requiring reliable, low-maintenance operation.

Key Features

• Normally open fail-safe position maintains airflow on power loss
• 24-volt, 2-wire spring return motor for simple low-voltage wiring
• Side-mounted motor allows easier access after installation
• Nylon bushings reduce operational noise for quieter zone control
• Rectangular form factor fits standard 16 x 8 inch duct openings
• Designed for air quality and zone control applications

Compatibility

Designed as an OEM-style replacement or new-installation damper for rectangular duct zoning systems requiring a 16 x 8 inch normally open spring return damper at 24 volts.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with low-voltage zone control wiring. Always de-energize the air handler and zone control board before connecting or disconnecting damper wiring. The 2-wire motor connects to a compatible 24-volt zone controller output. Confirm duct sizing matches the 16 x 8 inch damper frame before securing to avoid air bypass around the assembly.

Technical Specifications

• Size: 16 x 8 inches
• Shape: Rectangle
• Position: Normally Open
• Voltage: 24 volts
• Motor Type: Spring Return
• Motor Mount: Side
• Wires to Motor: 2
• Application: Air Quality

Standard Information

• Brand: EWC CONTROLS
• Manufacturer Part Number: 8x16 nd-rsd no