Heat exchanger

A cross-flow heat exchanger including a plurality of laterally spaced generally parallel first rectangular baffle plates having first and second pairs of opposite side marginal edges with the first pair of marginal edges of each plate disposed at generally right angles relative to the second pair of corresponding marginal edges of that plate, the first and second pairs of said edges including oppositely directed right angularly disposed side flanges extending therealong and terminating outwardly in oppositely outwardly directed right angularly disposed flange extensions, a generally rectangular divider plate disposed between each pair of adjacent first plates, said divider plate including first and second pairs of opposite side marginal edges, the last mentioned pairs of marginal edges including oppositely sharply reversely bent portions defining narrow opposite side channels extending along pairs of opposite side marginal edges of said plate opening toward each other and disposed on opposite sides of the medial plane of said plate, the pairs of opposite side channels of said divider plate snugly and slidably receiving the adjacent flange extensions of the adjacent baffle plates therein, thereby defining a parallelopiped having isolated side-by-side alternate generally right angularly disposed passages extending therethrough and whose opposite ends open outwardly through the four sides of said parallelopiped disposed between one pair of opposite sides thereof, and first and second pairs of tubular fittings including one set of corresponding ends of generally rectangular cross section, said one set of ends of said fittings being supported from said four sides.