With integrated damper motor, transducer and communicating controller with advanced control algorithms, we deliver a reliable function with innovative solutions for low leakage flows. This with basically infinite service life on the damper motor, which is based on stepper motor technology and not a DC motor with carbon that is worn down. The sensors are self-calibrating and require extremely low airflows. Dirt in the exhaust air duct has no effect as long as it is not grease that can seal the holes in the measuring flange.