Zonefirst ZDB-10X18 10HX18W Parallel 24V 2-Pos S/R

The Zonefirst ZDB-10X18 is a professional-grade 10HX18W Parallel 24V rectangular zone damper designed for heavy-duty HVAC airflow management. Engineered with a rugged extruded aluminum frame and parallel blade linkage, this 24V 2-Pos S/R unit provides reliable Fail-Safe operation via a specialized synchronous motor. As a bottom-mount zone damper, the motor is positioned on the wider 18-inch dimension, making it ideal for ceiling or floor-run installations where side clearance is restricted. The spring return mechanism ensures the damper defaults to an open position upon loss of power, a critical feature for maintaining ventilation and protecting system static pressure in multi-zone residential or light commercial ductwork. This 2-wire damper motor simplifies field wiring while offering adjustable minimum position settings for controlled bypass air, ensuring consistent comfort throughout the structure without the need for complex external linkages.

• Zonefirst ZDB-10X18
• 24V Spring Return Damper
• 10x18 Rectangular Zone Damper
• Bottom Mount HVAC Damper
• Fail-Safe 2-Wire Motor

• How do I wire a Zonefirst ZDB-10X18 for a 2-wire setup?
• What is the difference between side-mount and bottom-mount zone dampers?
• Can I use a 24V 2-Pos S/R damper as a fail-safe open unit?

• Durable Construction: Heavy-duty extruded aluminum frame with 3-inch parallel blades for low static resistance and long-term cycle reliability.
• Fail-Safe Security: The spring return mechanism automatically opens the damper during power outages to prevent equipment overheating or coil freeze-ups.
• Simplified Installation: Standard 2-wire 24V wiring integrates seamlessly with most modern zone control panels and HVAC thermostats.
• Adjustable Flow: Includes a mechanical set screw to establish a minimum air bypass, helping to alleviate high static pressure in small zones.
• Quiet Operation: Precision-engineered linkage and self-lubricating bushings ensure silent transitions during heating and cooling cycles.

• Is the motor replaceable? Yes, the 24V 2-Pos S/R motor can be swapped in under a minute by loosening the internal drive shaft set screw.
• Does this damper fit exactly 10x18? Like most HVAC dampers, it is manufactured 1/4 inch undersized to ensure a smooth fit inside standard 10x18 ductwork.
• Can this be field-converted? Yes, while it ships as Power-Close/Spring-Open, it can be field-converted to Power-Open/Spring-Close by adjusting the motor coupling position.

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.