GAS digital EC fan controllers provide optimal control over your Systemair EC fan. Not only does this highly efficient and convenient fan controller control both your exhaust and intake fans thermostatically, but it is also capable of intelligently reacting to any changes in the growing environment’s temperature. The RTT (Reactive Temperature Technology) works to actively monitor the environment and automatically adjusts the fan speed accordingly. Thus, you can reduce wear on the ventilation system whilst also saving energy. You can couple this EC fan controller with a fan balancer too for even better control over your exhaust and intake fans.