Patent ID: 7334629

Claim:
A heat exchanger made of plastic, said heat exchanger comprising a heat exchanger core and a housing, said core comprising (a) a plurality of plastic panels, each having side edges and broad surfaces, and a plurality of substantially straight parallel gas flow conduits to conduct gases in a first direction, and (b) a mounting structure securing said panels together at selected locations with said broad surfaces substantially parallel to and spaced from one another and forming a plurality of gas flow passageways for conducting gases between said panels in a second direction different from said first direction, with said gas flow passageways being isolated from said gas flow conduits, (c) said mounting structure and panels together forming a heat exchanging core having two opposed ends and four sides, a first opposed pair of said sides being defined by broad surfaces of said panels, and a second opposed pair of said sides being defined by the edges of said panels, and (d) a housing enclosing said four sides while leaving said ends open to conduct gas into and out of said flow conduits, said housing comprising first and second pairs of solid plastic panels, each covering one of said sides and being sealed at its edges to the adjacent panels, said second pair of solid panels covering said second pair of opposed sides having a pair of spaced-apart openings, each opening exposing said edges of said panels adjacent but spaced inwardly from one of said ends, and said solid panels extending outwardly from said core to form extending ducts at said openings to convey gas into and out of said gas flow passageways between said panels.