There are several ways to increase and decrease the mains supply voltage of fan motors in order to change the speed. The most commonly used variants are Transformer Based or Phase Controlled Modulator. So Ruck made a high-quality Transformer based speed controller to change the speed. A Transformer only changes the amplitude of the sine wave. This means that there is no abrupt increase in the current or any change of the frequency, leading to smooth speed control of the fan without any additional increase of the noise or the heating of the fan motor. Ruck offers a silent way to reduce the airflow of the fan and it is a robust and reliable addition to any grow room.
We, at Hydro Experts, sell Ruck Transformer Based Speed Controllers.