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The Arzel Zoning Technology MOD-BYP12 is a 12" modulating bypass damper kit for HVAC zoning systems, providing pneumatic modulation and static pressure feedback. The kit includes a spring-open damper and a pressure transmitter that measures supply duct static pressure and automatically adjusts the bypass to maintain proper airflow. It is universally compatible and specifically designed for use with variable-speed motors. Made in the USA.
12" round modulating bypass kit with pneumatic operation and pressure transmitter; made in the USA.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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