Filter assembly for a vehicle heating or air conditioning system, filter unit for this purpose and method for the production of the filter assembly.

A filter assembly (10) for a vehicle heating or air conditioning system comprises a filter unit (22) which is cuboidal in the delivery condition. This filter unit (22) is inserted into a filter holding housing (24) and, in the process, is compressed to give a different cross section, which preferably has a trapezoidal shape.