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The ornamental design for a flue pipe heat exchanger, as shown and described. |
FIG. 1 is a perspective view of a flue pipe heat exchanger, showing my new design;
FIG. 2 is a front elevational view, the rear elevational view being substantially identical thereto;
FIG. 3 is a top plan view, thereof;
FIG. 4 is an elevational view of one side, the opposite side view being substantially identical thereto;
FIG. 5 is a bottom plan view; and,
FIG. 6 is a perspective view as FIG. 1, but taken to a reduced scale, the broken line representation of the flue damper handle and the stove being included solely for illustrative purposes, forming no part of the claimed design.
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