The air filter system for a car heating and air conditioning system comprises a filter (12) mounted in a frame (14, 16, 17, 18). The top section (20) of the frame is flexible and forms a seal when a lid (40) is fitted on to the system.

The bearing for essentially parallel shafts (20, 30) consists of coaxial supporting sleeves (12, 13, 14, 54) that overlap at least partly in an axial direction, especially by the thickness of an intermediate wall (10) or at least 4 mm. The shafts can be le...

The control for an air valve in a car heating or ventilation system comprises a belt (10) with spherical sections (14) along its length. These cooperate with the teeth of a cogwheel (23) to turn a shaft (22) on which the valve is mounted.

The fuel cell complex (10) is temperature controlled by a heat exchanger (11) connected to a heating/cooling circuit (30) through a pump (39) and a second air conditioning cooling circuit (20) through a 3-way valve (38) for additional cooling.