| 摘要 |
<p>A filter element consists of a zig-zag folded filter medium (11) in plate form, enclosed in an oval peripheral frame (12) of polyurethane foam. The filter medium has slanting side regions reproducing the oval contour, so that a maximum possible filtration surface is obtained with minimal cutting. The opening of the frame has a peripheral groove (13) or flange to provide a seal.</p> |
