Fan speed control possibilities

Increase your comfort and save energy


A slight reduction in fan speed (or average airflow rate), has a major impact on the fan’s electrical energy consumption. A typical HVAC fan follows a quadratic torque curve. By continuously optimizing the fan speed to the local requirements, a significant amount of energy can be saved.

The reduction of the average airflow causes the air filters to last longer. The clogging of these filters is related to the total volume of air handled by the system after a certain period of time.



AC motor control

AC motor control


Local motor control



Local fan speed control is a basic way to control the rotational speed of a ventilator. Via a knob integrated on the fan speed controller, the fan speed can be set manually. It provides the possibility to the operator to manually select the preferred ventilation rate.


Our product range provides control solutions for Local fan speed control:





5-step fan speed control Stepless fan speed control Stepless fan speed control
AC voltage controllable motor AC induction motor

Remote motor control



In some applications, the control unit is installed separately from the fan speed controller.


Our control units (potentiometers) are suited for inset or surface mounting and offer a smooth, contemporary design. The fan speed controller can be installed in the technical room or nearby the motor.





Stepless fan speed control Stepless fan speed control
AC voltage controllable motor AC induction motor

Demand based motor control



Demand controlled ventilation is the best choice for most ventilation systems. The ventilation system is automatically adapted to the local circumstances. This solution provides the best balance between optimal indoor air quality and energy efficiency. In case a room is occupied, the ventilation system will operate at a high intensity to assure an optimal indoor air quality. In case the room is empty, the ventilations system will work at minimum speed to save energy.

Our range of sensor controllers can directly control an EC fan or an AC fan via an EVSS or MVSS fan speed controller via a 0-10 VDC signal or via Modbus RTU.


Demand controlled
AC voltage controllable motor

EC motor control


Manual EC motor control



Our product range offers various types of potentiometers that can be used to control EC fan: stepless fan speed control for more precise and infinitely variable regulation or control in steps for simpler regulation based on predefined values. Both options offer minimum and/or maximum output voltage adjustment, inset or surface mounting and many more control possibilities fitted together in a user-friendly design.







Stepless fan speed control 3-step fan speed control
EC motor with 0-10 VDC input EC motor with 0-10 VDC input

Demand based motor control



Demand controlled ventilation is the best choice for most ventilation systems. The ventilation system is automatically adapted to the local circumstances. This solution provides the best balance between optimal indoor air quality and energy efficiency. In case a room is occupied, the ventilation system will operate at a high intensity to assure an optimal indoor air quality. In case the room is empty, the ventilations system will work at minimum speed to save energy.

Our range of sensor controllers can directly control an EC fan via a 0-10 VDC signal or via Modbus RTU.



Demand controlled
EC motor