Patent ID: 8123836

Claim:
An apparatus for processing air comprising: a filter assembly having one or more filtering elements configured to receive ambient air from a chamber of a housing, the filter assembly including a receiving surface having an area; an air flow guide located proximate an intake vent of the housing and having a first portion and a second portion, the first portion being configured to form a passage within the housing between the input vent and the second portion, and the second portion being configured so as to have a curved radial portion, curved away from the intake vent to divert and accelerate air flow of the ambient air from the passage to the chamber such that a cross sectional area of the air flow in the chamber is substantially the same as the area of the receiving surface of the filter assembly and is generally evenly distributed relative thereto; and a variable-speed fan configured to draw the ambient air from the chamber through the filter assembly and to generate processed air based on the ambient air.