| 摘要 |
An air filter for use with a forced air handling system has a pad of air-permeable material held in a bordering frame. The bordering frame has a generally U-shaped cross section, with opposing legs extending a short distance over the edge of the pad of air-permeable material. The legs of the bordering frame have spaced apertures extending through them; and scented material is placed within the frame and located so that air passage through the apertures in the frame passes through the scented material to evaporate or volatilize the scented material and supply it to the filtered air flowing through the filter pad.
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