Negative air control unit and closure

Details Negative air control unit and closure Negative air control unit and closure

1989-12-08

1991-07-16

Bennett, Henry A.

98 1, E06B 702

Patent

active

050315161

ABSTRACT:
A variable air flow orifice for variable air control structures including an adjustable flap panel formed over one opening in a wall or door of the negative air structure. The adjustable flap is formed in the panel and secured thereto by a zipper including one or a pair of zipper pulls. The opening also can be covered by a screen.

REFERENCES:
patent: 1856658 (1932-05-01), Rummler
patent: 3282274 (1966-11-01), Scott
patent: 4706551 (1987-11-01), Schofield
patent: 4928581 (1990-05-01), Jacobson

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