Filters.

摘要

A filter unit for use in a heating and ventilating system in a motor vehicle comprises a cartridge-type filter (1) having a frame defining an aperture across which a filter medium extends and a housing (2) adapted to be mounted in an air flow passage in the heating and ventilating system. The housing (2) defines an aperture surrounded by a slot (18) which is designed to removably receive the filter such that the apertures in the filter (1) and the housing (2) are aligned with the air flow passage. The filter frame and the filter medium are flexible and the frame carries a collar defining a recess which receives and forms a seal with part of an element defining the entrance to the slot (18).