Patent attributes
A filter assembly for providing filtered air to an enclosed space includes a housing having an exhaust port in fluid communication with the enclosed space, a first air intake port in fluid communication with the enclosed space, and a second air intake port in fluid communication with a space exterior to the enclosed space. The assembly includes a disposable filter for filtering air from at least one of the first air intake port and the second air intake port. The assembly simultaneously filters recirculated air from the enclosed space and pressurizing air from the space exterior to the enclosed space. The filtered air is provided to the enclosed space through the exhaust port. Air pressure within the enclosed space exceeds the air pressure in the space exterior to the enclosed space when pressurizing air is drawn from the space exterior to the enclosed space and provided to the enclosed space.
