Abstract: In a heating/air conditioning system for a motor vehicle, with an exchangeable and selectively bypassable absorption filter which is arranged in a channel shaped housing and through which fresh air and/or circulating air can flow, a high degree of absorption is achieved when unprocessed air passing through internal leakage points at the absorption filter holder and the shut off bypass line of the absorption filter is collected and conveyed, via at least one line, to a location which is separated from the passenger space and the pressure level of which is lower than the pressure level on the flow off side of the absorption filter. Untreated air, which in certain circumstances escapes through external leakage points of a housing partition, is guided outside the passenger space, at the same time being prevented from overflowing into the latter.

Abstract: A ventilation unit for heating or air-conditioning in a motor vehicle. The unit includes a blower and a heat exchanger, with a diffuser positioned in the flow of air from the blower. The diffuser spreads the air flow so that it substantially covers the heat exchanger area. A grid positioned between the diffuser and the heat exchanger aids in spreading the flow of air to the peripheral portions of the heat exchanger.

Abstract: Disclosed is a heating and/or air-conditioning installation for automotive vehicles comprising at least one blower and a flap for affecting the flow of air, and an electronic control device for rotational speed control or speed shifting. The control device which comprises one or more electronic components capable of generating significant amounts of heat, is mounted on the flap, in order to cool the electronic components while only minimally interfering with the flow of air in the heating and/or air-conditioning installation.

Abstract: A radial blower, especially for heaters and/or air conditioning systems of motor vehicles. The radial blower including a housing having a front portion provided with an air intake opening and a back portion provided with discharge or exit openings. The housing is adapted to accommodate a drive motor for a fanwheel which is manufactured as a one piece plastic part. The fanwheel includes a fan ring with fan blades and a hub. A spacer is provided for connecting the fan ring with the fan blades. A spacer is provided with openings having spokes disposed therebetween. The spokes constitute a bundle of springs connected in parallel. Openings in a back portion of the housing and/or the drive motor have a limited cross section for drawing in a sufficient flow of cooling air.

Abstract: The invention relates to a radial fanwheel, wherein the fan blades are connected to a hub by spokes. Each fan blade is connected by connecting elements to the adjacent fan blades in the vicinity of their ends. Specifically, the spokes and connecting elements, as well as the fan blades themselves, are elastically deformable by the loads which develop.