| 摘要 |
Disclosed is a filter (1) comprising a sheet-like filter material (2) capable of being folded in a pleat form, two filter frame members (3) each provided on each side of the filter material (2) and each free to be expended and folded in the longitudinal direction of filter material (2), and a plurality of support members (4) appropriately arranged in the longitudinal direction of the filter material (2) and each of which extends between two filter frame members (3) in the transverse direction of the filter material (2). By this invention, provided is a filter excellent in attachment and detachment property in a small space, and having a sufficient strength at a simple structure, and which can be manufactured at a reduced cost.
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