| 摘要 |
Improved double-stage air filter of modular construction for attachment between aligned openings of a spaced double wall structure in order to supply filtered air flow to a controlled area. The filter is generally made up of casing means and combined plate and sleeve means. Both the casing means and plate means are provided with a flange means. The sleeve means is provided with a series of perforations and the plate means flange means is provided with a plurality of relatively spaced slots. The casing means flange means is affixed to the outer wall so that the casing means extends between the walls. The plate means includes retainer means that is affixed to the inner wall so that the sleeve means is inserted in the casing means. Inner and outer filter means for cleaning and purifying an air flow are disposed about the sleeve means. Retainer means are connected to the casing means flange means so as to hold the filter means in sealing engagement between the last mentioned retainer means and the plate means. During use of the filter, an airflow to be filtered is directed through the sleeve perforations, the filter means, and the slots of the plate means flange means thereby supplying filtered air to the controlled area. Depending on the filtered air flow requirements of a controlled area, one or more filters of the invention can be arranged in any suitable arrayed configuration in relation to the walled structure. Whenever a filter needs to be serviced the plate means retainer means is temporarily covered thereby preventing the entrance of unfiltered air to the controlled area. One of the advantages of the double-stage air filter is that it not only removes particles from an air flow, but also purifies same from the toxic effects of chemical, biological, radiological agents, or any combination thereof.
|
