The Geovent Flowguard can be connected to different pressure and flow sensors. The Flowguard can be used as a control unit only, emitting an alarm signal, when the pressure is wrong, for example. By using an extension module, it can also emit a 0-10 V signal to the control panel for the frequency inverter or modulating damper. Therefore, the Flowguard is an indispensable component in the energy optimized extraction system, because the Flowguard can give a sign to the frequency inverter to reduce or increase the pressure, so that you always have the correct and economical flow.