| 摘要 |
A plurality of large plenum chambers are provided for hanging from the ceiling of a room. Each supports four low profile filter units. Each filter unit includes a frame, circumscribing a filter which is mounted in the frame, and a sliding plate air flow control valve mounted above the frame. The air flow control valve has a flow control area which is generally coextensive with the area of the filter. A seal is effectuated between the frame and the plenum chamber by means of a sealing flange projecting upwardly from the strips supporting the filter units into a channel at the bottom edge of the frame. The channel is covered by a flexible membrane which is stretched over the top of the sealing flange. The plenums are suspended and joined together by a supension wire passing through matingly engaging joining brackets on adjacent plenum chambers.
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