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The ornamental design for a fireplace heat exchange unit, as shown. |
FIG. 1 is a top front and right side perspective view of a fireplace heat exchange unit showing my new design;
FIG. 2 is a front elevational view thereof on a reduced scale;
FIG. 3 is a rear elevational view thereof on a reduced scale;
FIG. 4 is a left side elevational view thereof on a reduced scale;
FIG. 5 is a right side elevational view thereof on a reduced scale;
FIG. 6 is a top plan view thereof on a reduced scale; and,
FIG. 7 is a bottom plan view thereof on a reduced scale.
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