Speed Control provides precise airflow regulation.

Low-cost OA11/22 speed control units deliver adjustable AC fan control for single or multiple fan assemblies… DALLAS, TX – Orion Fans has expanded its fan control product offering to include new speed control units that provide precise airflow control. The field adjustable OA11/22 dual channel phase control unit allows the user to control fan speed for single or multiple fan assemblies. The OA11/22 speed control units are designed for use with any AC fan or fan tray. This 120/220…

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[source: https://news.thomasnet.com/fullstory/speed-control-provides-precise-airflow-regulation-20057647]