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The ornamental design for an insulating cover for a building vent opening, as shown. |
FIG. 1 is a perspective view of an insulating cover for a building vent opening embodying my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front end elevational view thereof;
FIG. 5 is a rear end elevational view thereof;
FIG. 6 is a right side elevational view thereof; and
FIG. 7 is a left side elevational view thereof.
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