Patent ID: 6666910
Filing Date: 2003-12-23
Classification: B01D,F24F

Abstract:
An air filtration system for filtering air drawn into a substantially enclosed environment having an access opening, the system comprising:a box having sidewalls which is capable of being closed to provide a substantially enclosed interior; at least one filter having a body and a relatively rigid rim which encircles the filter body; a flexible sheet of substantially air-impermeable material capable of being sealed across the access opening of the substantially enclosed environment; and a pump having an inlet conduit through which air is drawn into the pump during pump operation so that by a) cutting openings in a sidewall of the box equal to the number of filters of the system wherein each opening cut in the box sidewall is sized to accept a corresponding filter when the filter is fitted therein; b) positioning the flexible sheet of substantially air-impermeable material across the sidewall of the box within which the filter-accepting openings have been cut; c) forming an opening in each region of the flexible sheet of substantially air-impermeable material which is positioned in registry with a filter-accepting opening of the box sidewall; d) fitting each filter into a corresponding filter-accepting opening of the box sidewall and the corresponding opening formed in the flexible sheet positioned in registry with the filter-accepting opening so that material of the sheet is sandwiched between the rim of the filter and the edge of the corresponding filter-accepting opening to thereby seal the filter within the corresponding filter-accepting opening and sealing the at least one filter across the access opening of the environment by means of the flexible sheet of substantially air-impermeable material so that any air flow from the outside of the environment into the box interior must flow through the body of the at least one filter; e) closing the box to thereby enclose its substantially enclosed interior; and f) connecting the inlet conduit of the pump to a sidewall of the box so that air which is drawn into the pump is pulled from the outside of the environment through the at least one filter and is discharged from the pump into the room in a filtered condition.