Apparatus for filtering air and for creating a positive/negative

Details Apparatus for filtering air and for creating a positive/negative Apparatus for filtering air and for creating a positive/negative

1993-08-02

1995-03-21

Warden, Robert J.

Chemical apparatus and process disinfecting, deodorizing, preser

For deodorizing of, or chemical purification of, or...

With means exposing gas to electromagnetic wave energy or...

55279, 553852, A61L 920, B01D 2911, B01D 4654

Patent

active

053993195

ABSTRACT:
A portable, convertible apparatus for creating either a negative pressure or a positive pressure in and filtering the air in a room, the apparatus comprising a housing having upper and lower ends. The housing defines an air flow path between the upper and lower ends and contains, within the air flow path, a HEPA filter and a fan. A dome-shaped inlet grille is mounted on the upper end of the housing, and a cylindrical outlet grille is mounted on the lower end of the housing. The apparatus also includes an annular cover for the outlet grille, which cover is adapted to communicate with the exterior of the room, and a dome-shaped cover for the inlet grille, which cover is adapted to communicate with the exterior of the room. The apparatus creates a negative pressure in the room when the annular cover is placed over the outlet grille and the dome-shaped cover is removed, and creates a positive pressure in the room when the annular cover is removed and the dome-shaped cover is placed over the inlet grille.

REFERENCES:
patent: 3630174 (1971-12-01), Runkle et al.
patent: 4118191 (1978-10-01), Bohnensieker
patent: 4210429 (1980-07-01), Golstein
patent: 4988372 (1991-01-01), Meline
patent: 5074894 (1991-12-01), Nelson
patent: 5203989 (1993-04-01), Reidy
patent: 5213595 (1993-05-01), Kim
patent: 5225167 (1993-07-01), Wetzel
patent: 5259854 (1993-11-01), Newman
Red Baron "Hepa-Vent" System-Aug. 1990.
"Two Good Reasons to Buy The Twinn 22."-Dec. 1990.
Coppus PFX-1500 Portable Filtration Unit-1992.
NSA 7100B Environmental Air System-1991.

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