| 摘要 |
The coarse (13) and fine (9) filters are joined in one piece into a filter set (6) in which the U-section fine filter (9) is joined to the coarse filter by one fine filter longitudinal leg. The coarse filter (13) has a rim-sealed frame (16) and both filters are of the same length in a set (6) whch is rectangular and symmetric. The set (6) is set in the housing (2) at right angles to the normal filter slant using a removal bow (19) held by a self-locking recessed part of the housing. Using the bow (19), the set (6) can be lowered home via seal (7) onto a pressure surface (8) of the housing.
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