An air-to-air heat exchanging system for a first air stream and a second air stream includes at least two air-to-air heat exchangers, each having heat conducting walls, secured to a frame. Two manifold assemblies, each including triangular dividers and triangular ends are positioned such that the triangular dividers and triangular ends are substantially perpendicular to the heat conducting walls of the air-to-air heat exchangers. Inlets and outlets for the first air stream and the second air stream are provided in the manifold assemblies.
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