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The ornamental design for a protective HVAC duct cover, as shown and described.
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FIG. 1 is a perspective view of a protective HVAC duct cover showing my new design;
FIG. 2 is a top plan view thereof, the bottom plan view being the same;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a top end view thereof; and,
FIG. 6 is a bottom end view thereof.
The drawings are lined for the color orange which form a part of the claimed design.
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