Zonefirst SPRD-20X12 Damper

The Zonefirst SPRD-20X12 is a professional-grade barometric static pressure regulating damper designed for precision airflow management in multi-zone residential and light commercial HVAC systems. Constructed from heavy-duty 22-gauge galvanized steel, this 20" x 12" rectangular bypass damper utilizes a single-blade, counter-balanced weighted arm mechanism to maintain optimal duct static pressure. As zone dampers close, the SPRD-20X12 automatically responds to increased pressure, diverting excess air to a return plenum or dump zone to prevent coil freeze-up and limit switch tripping. This mechanical pressure relief solution is essential for protecting PSC and variable speed blower motors from the high-velocity noise and backpressure issues common in restricted ductwork. The adjustable counterweight allows technicians to fine-tune the opening point up to 0.5" W.C., ensuring consistent CFM delivery across all active zones without the need for complex electrical integration. Its robust build and reliable performance make it the standard choice for balancing HVAC zoning systems.

• Static Pressure Regulation: Automatically bleeds off excess pressure to maintain system balance and efficiency.
• Equipment Protection: Prevents evaporator coil icing and high-limit furnace trips by maintaining minimum required airflow.
• Noise Reduction: Eliminates the "whistling" and air turbulence noise associated with high-velocity air in small zones.
• Mechanical Reliability: Operates entirely on air pressure with no 24V wiring or actuators required for basic function.
• Durable Construction: Built with a 22-gauge galvanized frame and a secure 5-inch wide end plate for a rigid, leak-resistant installation.

Can the SPRD-20X12 be installed in a vertical duct?
Yes, it is suitable for both horizontal and vertical mounting. However, when installed vertically, the weighted arm must be specifically adjusted to compensate for the weight of the blade to ensure accurate pressure relief.

What is the maximum static pressure setting for this damper?
The Zonefirst SPRD series is designed to regulate pressure up to a 0.5" W.C. maximum. For systems requiring higher pressure thresholds, electronic bypass options may be necessary.

How do I size the bypass for my zoning system?
The bypass should typically be sized to handle the difference between the total system CFM and the CFM capacity of the smallest zone, ensuring the air handler always sees its minimum required airflow.

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.