Patent ID: 8257156

Claim:
An electronics chassis for housing a plurality of electronics boards comprising: the chassis, having a front wall, a back wall, first and second lateral sidewalls, and a top wall extending over a portion of the area defined by the front wall, the back wall and the first and second lateral sidewalls; the chassis including an enclosure adapted to house a plurality of electronics boards; a lower plenum disposed in the chassis below the enclosure, the lower plenum having a height defined by the vertical distance between the bottom of the enclosure and the bottom of the first and second lateral chassis sidewalls having an air inlet defined by an opening below the lower edge of the front wall of the enclosure and an opening below the lower plenum extending from a plane defined by the front wall toward the back wall that is free of a bottom wall; and an upper plenum disposed in the chassis above the enclosure and extending from the front wall to the back wall, the upper plenum including: a rear surface associated with the back wall of the enclosure, the rear surface including an air outlet; a chamfered surface associated with the from wall of the enclosure; and a top surface extending between the rear surface and the top of the chamfered surface; wherein when the chassis is disposed on top of a like configured chassis, an opening into the lower plenum defined by the lower edge of the front wall and a chamfered surface of the like configured chassis has a minimum cross-sectional area that is greater than a cross sectional area of a height, as measured in the plane defined by the front wall and width of the lower plenum of the chassis.