The FM-EO wireless module is compatible with all Silvento-ec and Nexxt models. In the exhaust system, the Silvento-ec and the ventilation behaviour can also be optimised with the coupled outdoor sensor SFT-EO. In conjunction with e² fans on a universal control unit with UNI-EO module, sensor values can be exchanged and the ventilation operations of the systems can be coordinated. The same applies to the combination Nexxt and Silvento ec. If several Nexxt units are operated in one utilisation unit, a temperature-controlled ventilation operation can be achieved by targeted cross-ventilation of the units among themselves. It is also possible to react efficiently to varying outside temperatures and to keep the inside temperature constant.