Air curtain producing an outward ramping effect for use with an

Details Air curtain producing an outward ramping effect for use with an Air curtain producing an outward ramping effect for use with an

1990-08-03

1992-05-19

Makay, Albert J.

Ventilation

Having protecting air current

Cabinet enclosure

454 57, F24F 900

Patent

active

051137496

ABSTRACT:
An apparatus for producing an air curtain comprising a central opening bounded by a frame on the top, bottom, and sides which defines internal channels which fluidly communicate with one another. The bottom and sides of the frame define apertures of varying diameter proximate to the lower portion of the central opening. The apertures are arranged in an array whereby rows of apertures more closely proximate to the front edge of the central opening have diameters greater than the diameters of the apertures in rows more closely proximate to the rear edge of the central opening. Air is drawn into the channels through the apertures, and the array of apertures produces a forwardly biased pressure gradient, the result of which is to cause a stream of air being expelled downwardly from the top of the central opening to ramp or curl forwardly toward the front edge of the central opening as that stream of air traverses the central opening. This forward ramping propels airborne particles and contaminants outwardly away from the front edge of the central opening. The air drawn through the apertures is recirculated through the channels, may be filtered and heated, and is expelled downwardly through an outlet at the top of the central opening as the stream of air. The array of apertures may be reversed so that the ramping or curling is directed rearwardly. The apparatus may be utilized in an access way such as a drive-through service window, or an enclosure for instruments.

REFERENCES:
patent: 2247892 (1941-07-01), Schneible
patent: 2935925 (1960-05-01), D'Ooge
patent: 3021776 (1962-02-01), Kennedy
patent: 3023689 (1962-03-01), Kurek
patent: 3254588 (1966-06-01), Truhan
patent: 3935803 (1976-02-01), Bush
patent: 4098616 (1978-07-01), Dorius et al.
patent: 4967645 (1990-11-01), Mattson

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