| 摘要 |
A filter unit (6) for airtight attachment to a framework of a cleanroom ceiling comprises a filter (8), a circumferential wall (7) surrounding the filter, and a downwardly projecting sealing knife (11) to be received in a sealant containing groove formed in said framework. The sealing knife (11) includes vertical weldable wall elements (14) interconnected by welding and mounted on the circumferential wall by airtight mounting means (10, 12).
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