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

A portable apparatus for creating a negative pressure in and filtering the air in a room, said apparatus comprising

• a generally cylindrical housing having a generally vertical axis and tipper and lower ends, said housing defining an air flow path between said tipper and lower ends, and said housing containing, within said air flow path, an annular HEPA filter with a lower end having therein an outlet, said filter being centered generally on said axis, a UV light source located inside said annular filter, and a fan located below said outlet of said annular filter,
• a dome-shaped inlet grille mounted on said upper end of said housing and centered on said housing axis,
• an outlet conduit which communicates with said lower end of said housing and which is adapted to communicate with the exterior of the room, and
• rollers supporting said lower end of said housing for movement on the floor of the room,
• said fan causing air flow from the room into said housing through said inlet grille, through said annular filter adjacent to said UV light source, through said annular filter outlet, and through said outlet conduit to the exterior of the room,
• said apparatus being convertible to an apparatus for creating a positive pressure in the room, and said apparatus further comprising a cylindrical outlet grille mounted on said lower end of said housing and centered on said housing axis, a dome-shaped cover for said inlet grille, said cover having therein an inlet, and an inlet conduit which communicates with said cover inlet and which is adapted to communicate with the exterior of the room, such that when said outlet conduit is removed and said cover is placed over said inlet grille, air flows from the exterior of the room into said housing through said inlet conduit, through said inlet grille, through said annular filter adjacent to said UV light source, through said annular filter outlet, and through said outlet grille into the room.

A portable, convertible apparatus for creating either a negative pressure or a positive pressure in and filtering the air in a room, said apparatus comprising

• a housing having opposite upper and lower ends, said housing defining an air flow path between said upper and lower ends, and said housing containing, within said air flow path, a HEPA filter, and a fan,
• an inlet grille mounted on one of said ends of said housing,
• an outlet grille mounted on the other of said ends of said housing,
• an outlet cover for said outlet grille, said outlet cover having therein an outlet,
• an outlet conduit which communicates with said outlet of said outlet cover and which is adapted to communicate with the exterior of the room,
• an inlet cover for said inlet grille, said inlet cover having therein an inlet, and
• an inlet conduit which communicates with said inlet of said inlet cover and which is adapted to communicate with the exterior of the room,
• said apparatus being operable to create a negative pressure in the room when said outlet cover is placed over said outlet grille and said inlet cover is removed, said fan causing air flow from the room into said housing through said inlet grille, through said filter, and through said outlet conduit to the exterior of the room,
• said apparatus being operable to create a positive pressure in the room when said outlet cover is removed and said inlet cover is placed over said inlet grille, said fan causing air flow from the exterior of the room into said housing through said inlet conduit, through said inlet grille, through said filter, and through said outlet grille into the room.

A portable, convertible apparatus for creating either a negative pressure or a/positive pressure in and filtering the air in a room, said apparatus comprising

• a generally cylindrical housing having a generally vertical axis and opposite upper and lower ends, said housing defining an air flow path between said upper and lower ends, and said housing containing, within said air flow path, an annular HEPA filter with a lower end having therein an outlet, said filter being centered on said housing axis, a UV light source located inside said annular filter, and a fan located below said outlet of said annular filter,
• a dome-shaped inlet grille mounted on said upper end of said housing and centered on said housing axis,
• a cylindrical outlet grille mounted on said lower end of said housing and centered on said housing axis,
• an outlet cover for said outlet grille, said outlet cover having therein an outlet,
• an outlet conduit which communicates with said outlet of said outlet cover and which is adapted to communicate with the exterior of the room,
• an inlet cover for said inlet grille, said inlet cover having therein an inlet, and
• an inlet conduit which communicates with said inlet of said inlet cover and which is adapted to communicate with the exterior of the room,
• said apparatus being operable to create a negative pressure in the room when said outlet cover is placed over said outlet grille and said inlet cover is removed, said fan causing air flow from the room into said housing through said inlet grille, through said filter, and through said outlet grille and said outlet conduit to the exterior of the room,
• said apparatus being operable to create a positive pressure in the room when said outlet cover is removed and said inlet cover is placed over said inlet grille, said fan causing air flow from the exterior of the room into said housing through said inlet conduit and said inlet grille, through said filter, and through said outlet grille into the room.