Method of manufacture of an air-to-air heat exchanger

Claim 1

In the manufacture of a heat exchanger comprising a housing and substantially parallel exchanger plates disposed within said housing defining a multiplicity of channels disposed side by side between the exchanger plates, which channels are provided as two separate sets of channels extending between the ends of the housing, the method comprising: assembling a plurality of separate heat exchanger plates into a unit in substantially the same relative position they have within said housing by supporting the exchanger plates in spaced relationship with a spacer means which is permanently attached to the longitudinal edges of said plates to fasten said plates together in said spaced relationship; joining the opposite ends of the exchanger plates to the ends of other exchanger plates adjacent thereto, at least some of said plates having ends divided into two end portions which are joined to different exchanger plates on opposite sides thereof to form said two separate sets of channels; preparing a layer of uncured hardenable resin; positioning the assembly of exchanger plates with a set of adjacent longitudinal edges including portions of the joined ends of the exchanger plates sunk into said layer; permitting the layer to harden to form a slab which is joined and encases said edges; and mounting said assembly within an enclosing housing with said slab forming part of said housing.