The ECA series is a new type of EC inverter mixed-flow duct fan with low noise level, small size, wide application and environmentally friendly materials. The fans have a cold-rolled sheet metal housing, an engine type double fan blade structure and a cutting edge EC DC inverter motor with overload protection. Low energy consumption and high air volume and pressure. Digital signal control, multi-directional adaptation to market demand using mini 0%-100% infinitely adjustable speed, also optional concealed speed regulator into the wall, LCD touch screen, remote wireless remote control.