| 摘要 |
The invention relates to a cassette filter comprising a frame and a pleated filter material that is inserted therein, in addition to a protective grid having passage holes. Said protective grid is fastened at a distance from th e filter material in the frame and has a flow resistance that is smaller than that of the pleated filter material. The invention is characterized in that the protective grid (1) consists of at least one film strip (2) that is bent around the passage holes (3), said film strip extending parallel relative to the direction of flow (4) of the medium to be filtered, and in that the protective grid recurrently contacts at least one other identically bent fil m strip (5) outside the passage holes (3) in contact points (6) and is glued t o said other film strip in the contact points (6).
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