FANTECH says its PowerLine EC series of in-line centrifugal fans and the roof-mounted Gamma EC and GL Gamma series have built-in efficient electronic commutation motors.
EC motors use electronics to periodically reverse the current direction between the rotor and the external circuit, so a DC motor can be plugged into a standard 240V supply.
As the electronics control the ramp up speed, in-rush current is kept to a minimum which means that the fan never draws more than the rated full load amps.
According to Fantech, by combining the efficient DC motor and on-board speed control, it has managed to reduce noise and provide power savings.
The electronics of the EC motor responds to 4 to 20mA or 0 to 10V signals. They can be factory programmed to work with a large range of sensors. The signals from the sensors will then speed up or slow down the fan according to its requirements.
Fantech also added extra functionality to the EC range by way of a demand control ventilation system. The controller uses the feedback from sensors to automatically control the amount of ventilation required.