Apparatus for filtering air and for creating a positive/negative pressure
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United States of America Patent
Stats
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Mar 21, 1995
Grant Date -
N/A
app pub date -
Aug 2, 1993
filing date -
Aug 2, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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