| 摘要 |
A disposable air filter comprising a sheet of filter media, at least portions of the major surfaces of which are disposed to define parallel planes along those opposite major surfaces of the sheet intended to be placed normal to the direction of movement of air through the filter; and a frame. The frame includes (1) a peripheral frame component around a rectangular peripheral edge of the sheet of filter media, which peripheral frame portion comprises elongate edge wall portions extending along and across the peripheral edge of the sheet of filter media, which edge wall portions are disposed at generally a right angle with respect to the parallel planes defined by the sheet of filter material; and elongate retaining wall portions extending from opposite elongate edges of the edge wall portions for short distances along the major surfaces of the sheet of filter media with parts of the attachment wall portions opposite each other and spaced from the edge wall portions being attached to the sheet of filter media; and (2) a reinforcing frame component comprising elongate outer wall portions overlaying and attached along outer surfaces of the edge wall portions with the outer wall portions disposed at generally a right angle with respect to the parallel planes defined by the filter media, and a side wall portion extending from the outer wall portions along and parallel to the plane defined by the first major surface of the sheet. That side wall portion includes a continuous retaining wall part extending a short distance from corresponding edges of the side wall portions at about right angles with respect to the side wall portions, and can also include intersecting grid-like parts extending between oppositely disposed locations along the retaining wall part and defining large openings through the side wall portion that afford free passage of air through the side wall portion.
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