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SMSCom Plug-in Smart Fan Speed Controller The SMSCom Plug-in Fan Speed Controller is a quality piece of kit that lets you easily adjust the speed of your intake or outlet duct fan with the turn of the knob. You have the choice of a base unit or with the addition of the temperature sensor. Without the temperature sensor the SMSCom Smart Controller acts as a basic manual fan speed controller giving you 60 different speed settings. With the added temperature probe it can act completely independently, keeping your room to user set parameters with a fan speed minimum, making it incredibly easily to give your s the perfect environment. SMSCom – Very reliable and great value-for-money Plugs straight into a mains socket Wide adjustment fan-speed control Upgradeable with the addition of the plug-in SMSCom thermostat Can supply up to 1500 Watts (6.5 Amps) Please note: though digital fan speed controllers (like this one) are a very cost-effective solution, they may generate a humming sound. This is an unavoidable consequence of using 'pulse width modulation' to regulate fan output. We highly recommend SMSCom Hybrid Fan Speed Controllers, which instead use heavyweight transformers and run completely silent. For more information, see this post on the One Stop Grow Shop Blog: This fan speed controller is not designed for use with Isomax fans. If that’s your intention, then please take a look at the SMSCom Hybrid Controller or the Control Freak instead. How the SMSCom Plug-in Smart Fan Speed Controller Works: The SMSCom plug-in Smart fan speed controller is a great little piece of kit that allows you to control the speed of your in-line duct fan. The unit plugs directly into a mains outlet and your extraction fan plugs directly into the socket located on the front of the unit. The control on the front of the unit allows the user to manually adjust the speed of the