The Can-Fan Speed Controller regulates the speed of EC Fans to maintain optimal temperature and humidity conditions within the grow room. Controls Temperature and HumidityThe sensor monitors the current temperature and humidity levels within the growing room, and gradually increases the fan speed until levels are achieved. Minimum and Maximum Fan SpeedsIt is very important to set the correct minimum fan speed, so fans do not burn out from running too slowly. LCD DisplayEasy to read, easy to use design Controls intake and exhaust fansThe two ports on the controller allow intake and exhaust fans to be treated differently. Constant negative air pressureThe intake and exhaust fans can be programmed to maintain a negative air pressure within the grow room. Day-Time / Night-Time settingsSeparate settings for day and night can be programmed. This controller will only work with the Can-Fan Q-Max EC range of fans and the Satellite Fan Controller.