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			 The ornamental design for an air filtering device designed for installation over an interior vent grill of evaporative coolers, as shown and described
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FIG. 1 is a front elevational view of the air filtering device designed for installation over an interior vent grill of evaporative coolers showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a right view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is an isometric view thereof.
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