Patent ID: 7839637

Claim:
An apparatus comprising: a square shaped chassis; a card chamber for locating at least one electronics card therein; an air intake through which ambient air from outside the apparatus can flow into the card chamber; an airway located across the card chamber from the air intake and into which air can flow substantially linearly across the card chamber; an exhaust plenum located adjacent the card chamber and the airway; a plurality of fans operable to draw air from the airway laterally across the card chamber and into the exhaust plenum, which is positioned to direct the air laterally to a set of exhaust openings in a back panel of the apparatus, wherein the fans are coplanar with the exhaust plenum and the exhaust openings; an air filter positioned in the card chamber and abutting a first sidewall; and an air flow balancing plate having an upper end and a lower end, wherein the airflow balancing plate includes progressively larger holes that extend down the airflow balancing plate.