Air baffle attachment to a heat exchanger

A clamshell heat exchanger panel has a pocket formed in an edge of a land portion of the panel so that a fastener can be inserted into the pocket, with its axis in the plane of the heat exchanger panel. This allows attachments to be made directly to the exchanger panel without affecting the integrity of the gas-carrying conduit portion of the panel. The pocket is made by forming mirror image indentions in the land portions of the two sides of a sheet metal workpiece such that, when the two sides are folded together, the indentions cooperate to form the pocket. Openings can also be formed through the land portions of the two sides so that, upon a folding together, the openings define an opening into the pocket.