SMS 4.5A Mark 2 Twin Fan ControllerSMS 4. 5A Mark 2 Twin Fan Controller A plug and play twin fan controller that runs two fans through a single unit plug the fans into the front, plug the controller into the wall, configure and walk away. All fan power draw runs through the box, so total capacity is limited to the 4. 5A unit rating; plan your fan wattages accordingly. Why growers choose the SMS 4. 5A Twin Controller: Runs two fans from one unit typically intake and extract fans on one
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