Filter insert for use in air inlet ducts for car heaters comprises section cut from a bellows strip to give a diagonal surface, triangular plastic component being fixed to surface and filling gap between insert and duct walls

摘要

Filter insert for use in ducts of different shapes comprises a section cut from a bellows strip (R) to give a diagonal surface (L2). A triangular, trapezoidal, rhomboidal or curved plastic component (S2) is fixed to the surface and fills the gap between the insert and the walls of the duct.