The VRC-238 is a field adjustable high capacity constant airflow regulator.

This round damper is designed to provide automatic, precise, balanced pressure-independent maximum constant airflow in round duct systems without use of electricity, sensors or controls.

VRC-238 is the next-generation of the VRK-233 constant airflow regulator.

This enhanced version showcases an advanced, durable, easy to adjust lock-in nub for airflow control, meticulously designed for optimal performance and efficiency.