Automatically slows down or speeds up centrifugal fans to respect user selected temperature day and night setpoints. Enables a much tighter and precise temperature curve. When ON/OFF controls usually yields a variation over 5°F/3°C, TV1 will yield a variation below 2°F/1°C. 6 foot cord with temperature sensor precise to 2°F/1°C. Can drive single phase 120 V induction motor type fans up to 750 Watts. Any forced ventilation rooms should be equipped with this type of control to promote faster and more vigorous growth.
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