| 摘要 |
A plurality of air filtration units located within an enclosed contaminated space have their exhaust connected to an air box located within the enclosed space. The interior of the air box is in communication with an area outside of the enclosed contaminated space. An isolation chamber is mounted on one wall of the air box to permit the insertion of air sampling cassettes into the interior of the air box so that the exhaust air in the air box may be monitored. The isolation chamber also permits the selective removal of the air sampling cassettes from the air box. In both the insertion and removal operations, the isolation chamber prevents contaminants from being released into the enclosed space.
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