Title: Air filtration apparatus

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Abstract: A portable apparatus for directing a filtered stream of air downwardly over a predetermined area such as a hospital bed or the like. The apparatus includes a cantilevered plenum chamber adapted to be positioned horizontally over the bed, the plenum chamber comprising two segments hingedly interconnected so that the forward segment thereof may be dropped downwardly to facilitate movement and storage. The bottom wall of the plenum chamber comprises an openwork screen bounded by a peripheral slot, and a layer of filtering media overlies the screen such that a first portion of the air entering the plenum chamber is directed downwardly through the filtering media and screen at a relatively low velocity and in a substantially laminar flow pattern, and a second portion of the air is directed through the open slot to define a peripheral air curtain of relatively high velocity. The air curtain thereby serves to prevent the incursion of unfiltered air from the surrounding environment. The plenum chamber is tapered to achieve a substantially constant pressure drop along its length, and the inside lip of the slot is lower than the outside lip to direct the air curtain somewhat outwardly. The unit further includes a low resistance filter to filter the air entering the plenum chamber, the low resistance of the filter permitting the use of a relatively small blower which can be operated on conventional household current.


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