Exhaust Fan

FIG. 1 is a bottom front perspective view of an exhaust fan showing my new design; FIG. 2 is top front perspective view of the design shown in FIG. 1 ; FIG. 3 is a front view of the design shown in FIG. 1 ; FIG. 4 is a rear view of the design shown in FIG. 1 ; FIG. 5 is a left side view of the design shown in FIG. 1 ; FIG. 6 is a right side view of the design shown in FIG. 1 ; FIG. 7 is a top view of the design shown in FIG. 1 ; and, FIG. 8 is a bottom view of the design shown in FIG. 1 . The broken lines shown in the figures are included for the purpose of illustrating portions of the exhaust fan and form no part of the claimed design.