ZoneFirst SPRD-20X10 Damper

The ZoneFirst SPRD-20X10 is a heavy-duty barometric static pressure regulating damper designed for precision airflow management in multi-zone HVAC systems. Built with 22-gauge galvanized steel, this 20-inch wide by 10-inch high rectangular bypass damper is engineered to handle airflow ratings up to 2000 CFM. As zone dampers close, duct static pressure naturally increases; the SPRD-20X10 automatically compensates by opening its single-blade mechanism to bypass excess air back to the return plenum or a dump zone. The counter-balanced weighted arm allows for field-adjustable pressure settings up to 0.5 inches W.C., ensuring optimal velocity and reducing air noise at the registers. This mechanical bypass solution requires no electrical wiring, making it a reliable choice for contractors looking to protect equipment from coil icing or high-limit trips. The unit supports both horizontal and vertical mounting (with specific counterweight orientation) and features a zinc-plated finish for long-term corrosion resistance in demanding mechanical room environments.

• Automatic Pressure Relief: The weighted blade responds instantly to changes in static pressure without the need for electronic controls or sensors.
• System Noise Reduction: Effectively prevents high-velocity "whistling" at the registers by maintaining consistent duct pressure as zones cycle.
• Rugged Construction: Fabricated from 22-gauge galvanized steel with a zinc plating to withstand continuous duty in HVAC environments.
• Flexible Installation: Designed for easy insertion into 20x10 rectangular ductwork, requiring only a simple side-slot cut for mounting.
• HVAC Equipment Protection: Helps prevent bypass-related issues like evaporator coil freeze-ups or furnace overheating by ensuring minimum airflow is maintained.

How do I adjust the SPRD-20X10 for my specific CFM requirements?
Adjustment is performed by moving the counterweight along the weighted arm. Slide the weight toward the end of the arm to increase the pressure required to open the damper, or toward the shaft to allow the damper to open at lower static pressures. For best results, set all zones to open first to ensure the damper stays closed under full load.

Can this damper be installed in a vertical duct run?
Yes, the ZoneFirst SPRD-20X10 supports vertical installation. However, a veteran technician must calibrate the counterweight precisely to offset the weight of the blade itself, ensuring the barometric action remains responsive to air pressure rather than gravity.

Is an electrical connection required for operation?
No, this is a mechanical barometric damper. It operates entirely on the physics of air pressure and counterweights, eliminating the need for 24V wiring or actuators, which simplifies the install for zoning bypass applications.

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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.