Controls electronics: to regulate and adjust the blower speed
The ventilation power is adjusted by a device that controls the blower speed. Two types of adjusting devices are used:
- Passive resistive devices that are adjusted in steps and contain two or three resistors corresponding to three or four speeds. The resistors are made of wire coils or mounted on a ceramic support.
- Power transistors for continuous adjustment. The type of control device is determined by the system architecture.