G.A.S Enviro4 Fan ControllerEnviro4 Fan Controller The Envrio4 controller developed by Global Air Supplies gives you complete control of your environment so you can optimise your grow. It controls EC fan speeds and can also regulate on and off times for practically any piece of equipment in your grow room (via the four programmable sockets). This simplifies your set up, making it easy to control your grow room and maintain a perfect environment from a single point. With the