The dual AC/EC fan controller is a mains powered, twin fan controller with enclosure, suitable for all EC 0-10V speed controllable and AC fans. The fans run alternately based on a selectable changeover period. Potentiometers allow setting of the two fan speeds, normal and boost. The fan speeds are selected by volt free contacts or 0-10V input. There is also an optional single-fan operation mode. Two VFC inputs - Normal/Boost and Remote on/off. Alarm output for fan fail, solid state relay 230V/8A contacts. LED for Fan Fault; LED Fan1/Fan2 run. Duty share/changeover 3/6/9/12/15/18/21/24 hour set via switch. Remote enable input, volt free contacts. Normal/Boost fan speed input. Current sensing 1 to 8 amp, pption to external boost/run via 0-10V input via BMS. Max adjustable output 0-10V to fans. Fan fault volt free contacts. Can select to start fan A or fan B