Ventilation for toilets, bathrooms, and kitchens in multi-storey buildings. Up to 40 units can be connected to one main duct. The new low-noise impeller ensures a high pressure characteristic combined with optimum efficiency. Energy consumption of only 0.3 watt/m³/h fulfils the latest standards in the energy saving regulations. The depth of the universal casing has been reduced by 25%; it is suitable for single / double room ventilation with left-hand, right-hand, or bottom connections. The flat design of the fascia allows inconspicuous integration in any room. Air extraction through the edge of the fascia prevents dirt accumulation.