| 摘要 |
A filter apparatus for mounting over an opening at an end of a forced air system duct has a filter frame with sidewalls between open front and back ends and a channel which opens inwardly of the sidewalls. At the front end is a sheet of preferably self charging electrostatic washable filter material behind a grill, both of which are peripherally disposed within the channel and are sized and sufficiently flexible so as to be removably insertable into the channel. A second sheet of a second filter material, preferably including activated charcoal, may be disposed in the channel behind the first sheet of filter material. The filter material may be made of a woven polypropylene and the sheet may have heat sealed finished edges. A wall mount having a support frame for mounting on a wall around the opening which extends through the wall is sized and operable to support the filter frame. The support frame may be mounted to a wall. A securing lock may be used to lock the filter frame in place within the support frame and may have a pin slideably and tightly disposed through aligned apertures in the filter and support frames.
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