The radio controlled ventilation units for conservatories and glass fronts are installed like a glass pane and can be powder-coated individually. The thermal separation of inner and outer face results in an excellent insulation value. The motorized ventilation units WL400 and WL800 extract (exhaust) or recirculate air (recirculation for heat gain and reduction of condensation). The fans run particularly quiet and energy-efficient. The air supply unit WL-Z400 uses pressure difference to let fresh air flow in. The flush inner housing part works as a diffuser and allows the use of a fly and pollen screen.