| 摘要 |
PURPOSE:To make it possible to arbitrarily set a desired local air highly cleaning range by installing an air cleaning unit at a part of an air flow-off opening of a plenum by use of a reticular support frame. CONSTITUTION:An air cleaning unit 3 contains a motor attached blower 8 and an air filter 9 in a box-shaped main body 3a. A rectangular support frame 3b to be actually installed to the plenum is projected downwardly to be mounted on the lower peripheral edge of the main body 3a of the air cleaning unit. Channel cells 10a having grooves receiving the support frame 3b of the unit 3 are disposed in a lattice form to constituted a reticular support frame 10, and the support frame 10 is attached to a part of the lower opening of the plenum 4. An arbitrary recticular part of the recticular support frame 10 is slected and the air cleaning unit 3 is installed at the recticular part. A recticular part where no air cleaning unit is provided is blocked by a blind plate 11.
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