SMSCOM Hybrid Controller
Controls fan syncronization for a quiter fan and cycles exhaust during night cycle. This is simply the best fan speed controller on the market and the only unit hydroworld recommend to use with max or centrifical fans. It sends a pulse back to the fan to eliminate the compacitor hum, you can turn your fan down with no worry about shortening the life of your fan. This unit also has a night humidity function a dual speed fan control to ramp your fan up and down depending on temperature.
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Very advanced controller, easy to setup.