Ventilation insert for automatic ventilation when window is closed, fits between the casement frame and the window casement, and is provided with an interchangeable cassette with pollen filter set in the air flow route

摘要

The ventilation insert (1) which fits between the casement frame and the window casement is provided with an interchangeable cassette (8) with pollen filter (11) set in the air flow route. The cassette can comprise a frame (9) spanned by the pollen filter.