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The ornamental design for a filter for a round fan, as shown and described. |
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FIG. 1 is a front view.
FIG. 2 is a rear view.
FIG. 3 is a right side view.
FIG. 4 is a left side view.
FIG. 5 is a top view; and,
FIG. 6 is a bottom view.
The broken-line in FIGS. 3-6 represents stitching.
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