BVAV is a variable/constant air flow device, complete with actuator, control unit and measuring device. The actuator is separate in the universal version. Minimum and maximum flows can be adjusted manually using two potentiometers on the regulator. Dynamic pressure sensor is standard.

The BVAV universal is also available with a static pressure sensor for dirtier environments. In the compact version the pressure sensor, regulator and actuator are integrated into a single unit. Minimum and maximum flows can be adjusted using a manual setting tool.