EWC Controls ND-RSD-8X30 Damper

As a direct replacement for the legacy ZoneFirst ZDB-8X30, the EWC Controls ND-RSD-8X30 is a professional-grade motorized rectangular zone damper engineered for high-static residential and light commercial HVAC systems. This 8" High x 30" Wide parallel blade unit features a 24Vac synchronous motor mounted on the 30" dimension to ensure high torque and reliable operation. Designed for power open, spring return closed applications, it provides a fail-safe solution that seals tightly to prevent air leakage in inactive zones.

The ND-RSD-8X30 utilizes a heavy-duty extruded aluminum frame and nylon bushings for ultra-quiet, long-term performance. Its two-wire hook-up simplifies field wiring, making it a go-to for technicians upgrading existing Ultra-Zone zoning systems. With a 97% leak-proof rating and overlapping blade design, this damper optimizes HVAC airflow control and improves overall system efficiency. This unit is built to withstand the rigors of constant cycling in demanding environments.

• Universal Compatibility: Serves as the official ZDB-8X30 replacement for seamless retrofitting in older ductwork.
• Quiet Operation: Precision-engineered nylon bearings eliminate metal-on-metal noise during blade transition.
• Fail-Safe Reliablity: The spring return motor ensures the damper closes automatically during power loss to maintain zone integrity.
• Robust Construction: The heavy-duty aluminum frame resists warping and provides a low-leakage seal rated at 97% effectiveness.
• Simple Integration: Standard 24V 2-wire motor configuration allows for rapid installation with most HVAC zone control panels.

Is the ND-RSD-8X30 field-reversible?
No, the motor is fixed as power open/spring return closed. Ensure your zoning logic matches this configuration before installation.

Where is the motor located on this specific model?
Following EWC industry standards, the motor is mounted on the second dimension provided, which is the 30-inch side.

Can I use this damper with a 3-wire system?
This model is a 2-wire spring return unit. For 3-wire power open/power close requirements, refer to the standard ND series specifications.

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.