Automatic exhaust air system with variable, humidity-dependent controlled volume flow. Electric, time-controlled demand ventilation level via on-site button, resets automatically after approx. 30 minutes. Automatic regulation of the volume flow, depending on the relative room humidity between min. and max. limit. Ready-to-install element for insertion into pipes with ND 125 mm including installation ring with lip seal. All parts made of high-quality antistatic plastic in white. For wall/ceiling installation. 230 V, 0.5 A, 3 W, IP X1, protection class II.