Air Circulation Fan

FIG. 1 is a front, top perspective view of an air circulation fan showing my new design; FIG. 2 is a front view thereof; FIG. 3 is a rear view thereof; FIG. 4 is a left side view thereof; FIG. 5 is a right side view thereof; FIG. 6 is a top view thereof; FIG. 7 is a bottom view thereof; FIG. 8 is a rear, bottom perspective view thereof; FIG. 9 is an enlarged detail view taken from portion 9 of FIG. 2 . FIG. 10 is an enlarged detail view taken from portion 10 of FIG. 3 . FIG. 11 is an enlarged detail view taken from portion 11 of FIG. 4 . FIG. 12 is an enlarged detail view taken from portion 12 of FIG. 6 ; and, FIG. 13 is an enlarged detail view taken from portion 13 of FIG. 7 . The evenly-dashed broken lines show portions of the air circulation fan that form no part of the claimed design. The dot-dash broken lines depict the boundary of the enlarged views and form no part of the claimed design.