Abstract: A furnace heat exchanger and support plate assembly are joined together by a cooperating oval rim defining an opening in the heat exchanger and an opening formed by a mating flange on a partition plate and extending perpendicular to the plane of the plate. The flange on the partition plate is inserted in the opening in the heat exchanger unit and expanded radially outward with respect to the central longitudinal axis of the openings by a multiple jaw expander mechanism which is inserted through the opening in the plate into the interior of the heat exchanger. A second expander apparatus is inserted in the opening after withdrawal of the first expander to engage and expand portions of the flanges which were not fully displaced by the first expander. The expander mechanisms include radially and axially movable jaws comprising plural oval shaped jaw segments which are engaged by an axially movable mandrel.

Abstract: A furnace heat exchanger and support plate assembly are joined together by a cooperating oval rim defining an opening in the heat exchanger and an opening formed by a mating flange on a partition plate and extending perpendicular to the plane of the plate. The flange on the partition plate is inserted in the opening in the heat exchanger unit and expanded radially outward with respect to the central longitudinal axis of the openings by a multiple jaw expander mechanism which is inserted through the opening in the plate into the interior of the heat exchanger. A second expander apparatus is inserted in the opening after withdrawal of the first expander to engage and expand portions of the flanges which were not fully displaced by the first expander. The expander mechanisms include radially and axially movable jaws comprising plural oval shaped jaw segments which are engaged by an axially movable mandrel.

Abstract: A top cover, motor, fan and fan shroud for an air conditioning unit are assembled into an integrated structure with motor supporting legs which attach to the top cover and cause the shroud to be drawn against the cover. The legs connect with the shroud in a manner serving to preserve the concentricity of the shroud, and attach to the inside of a band which can be tightened to assure containment of the motor in a defined position under the shroud and vented portion of the cover.

Abstract: A hot air furnace which includes at least one heat exchange unit having at least one mounting flange section defining an opening therein and a plate member having an aperture therein corresponding to at least one of the openings in said heat exchange unit and in alignment therewith with sheet insulating material interposed between said plate member and heat exchange unit by virtue of the said flange being expanded into a plane parallel to that of said plate member to thereby secure the plate member and interposed insulating material in place on said heat exchange unit.