Patent ID: 6264727
Filing Date: 2001-07-24
Classification: B01D

Abstract:
An air filtering method comprising circulating air with a portable fan having a rectangular housing with square inlet and outlet sides, placing the fan housing on a floor in a room, with the inlet and outlet sides spaced from and perpendicular to a wall of the room, promoting circular circulation within the room, using the fan during vacuum cleaning when micron particles are lifted from the floor and blown through a vacuum cleaner bag and are pulled downward toward the floor by gravity, filtering the air as it is drawn into the fan housing with a square filter having a filtering area of about 400 in.sup.2 and having a pleated thin filter sheet with an effective area of at least about 800 in.sup.2 secured to the inlet side of the portable fan, and supporting the pleated filter sheet with a screen lifting particles from a rug or floor with a vacuum cleaner, entrapping large particles in the vacuum cleaner and exhausting fine particles suspended in air from the vacuum cleaner into the room floating the exhausted and air suspended fine particles and moving the air suspended fine particles toward the floor under an influence of gravity, moving the air suspended fine particles toward the pleated thin filter under the influence of air circulation around the room by the fan and drawing the fine particles against the pleated thin filter and entrapping the fine particles with the filter.