Fume hood

Ventilation – Workstation ventilator – Covered workbench chamber

Patent

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Details

B08B 1502

Patent

active

054073898

ABSTRACT:
A fume hood defines a ventilated and enclosed work space surrounded by two opposed side panels, a rear panel connected between the side panels, and a top panel, with an access opening formed at the front of the enclosed work space between front-facing edges of the side panels. The side panels and rear panel of the fume hood are double-walled, defining interior flow spaces in fluid communication with each other. The interior flow space of the rear panel is in fluid communication with a negative pressure source and with the enclosed work space through egress openings formed on the interior wall thereof, such that contaminated air may be withdrawn from the work space by the negative pressure source and discharged to a benign area. The front-facing edges of the side panels are formed with ingress openings, in flow communication with the negative pressure source through the interior flow spaces, such that air flow through the ingress openings creates a negative pressure area adjacent the front edges and interior surfaces of the side panels, which then causes air flow entering the access opening to follow the contours of the side panels, reducing air turbulence and back flows. By avoiding the production of eddies and back flows at the front of the fume hood, undesirable outward forward movement of contaminated air from the work space is avoided or otherwise reduced.

REFERENCES:
patent: 3041957 (1962-07-01), Liptay
patent: 3049069 (1962-08-01), Whiston et al.
patent: 3284148 (1966-11-01), Ramniceanu
patent: 3318076 (1967-05-01), Baker
patent: 3895570 (1975-07-01), Eagleson, Jr.
patent: 4142458 (1979-03-01), Duym
patent: 4280400 (1981-07-01), Longworth
patent: 4409890 (1983-10-01), Longworth
patent: 4632022 (1986-12-01), Baitinger
patent: 5056422 (1991-10-01), Horntvedt

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