Ewc Controls 10x12 Nd-rsd No Rectangular Damper Spring Return

Product Description

The EWC CONTROLS 10x12 nd-rsd no is a motorized rectangular zone damper designed for forced-air HVAC zoning systems. Built in a 10 x 12 inch duct opening size, it uses a spring-return actuator configured normally open, meaning the blade defaults to the open position when power is removed. This fail-safe behavior maintains airflow through the zone during a power interruption or actuator fault. Licensed HVAC technicians install this damper as part of a multi-zone control system, pairing it with a zone control board and low-voltage thermostat wiring to regulate conditioned air delivery to individual zones.

This damper is suited for residential and light commercial forced-air zoning applications where rectangular duct configurations are present. The 10 x 12 inch form factor fits common trunk-line and branch-duct sizes used in central air and heating systems. Its motorized operation allows the zone controller to open and close the blade on demand, balancing airflow across multiple zones and improving overall system efficiency. It is particularly appropriate for retrofit zoning projects where spring-return, normally open operation is required by the system design.

Key Features

• Motorized actuator provides automatic, controller-driven blade operation
• Spring-return mechanism defaults to normally open on power loss for fail-safe airflow
• Rectangular shape fits standard 10 x 12 inch duct openings
• Designed for multi-zone HVAC systems controlled by a low-voltage zone board
• Spring return eliminates the need for a powered close signal, simplifying wiring

Compatibility

Designed as an OEM-style motorized zone damper for rectangular duct zoning systems requiring a normally open, spring-return actuator configuration in a 10 x 12 inch size.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with zoned forced-air system wiring and duct modification. De-energize the air handler and zone control board before installing or wiring the damper. Follow the zone controller manufacturer's low-voltage wiring diagram and applicable mechanical codes for duct penetrations and fastening. Verify blade orientation and airflow direction before securing the damper in the duct.

Technical Specifications

• Shape: Rectangular
• Size: 10 x 12 inches
• Motorized: Yes
• Actuator Type: Spring Return
• Default Position: Normally Open

Standard Information

• Brand: EWC CONTROLS
• Manufacturer Part Number: 10x12 nd-rsd no