An apparatus for housing and cooling circuit card assemblies employed in
communication and other systems is disclosed including a chassis having
opposed end walls which are formed with a series of spaced inlet card
guides and correspondingly spaced outlet card guides, respectively. A
straight-pass heat exchanger is directly mounted to each circuit card
assembly via thermally conductive material, and opposed ends of the heat
exchanger are mounted by a wedge lock to respective inlet and outlet card
guides. The heat exchanger employs unique angled interface geometry that
creates a gasketless airtight joint with complimentary inlet and outlet
card guide geometry through which cooling air passes.