The ornamental design for a heatdissipationfan, as shown and described.
FIG. 1 is a perspective view of the heat dissipation fan showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view of another aspect of the “heat dissipation fan”, showing parts of the “heat dissipation fan” which is in a closed state.
The broken line showing of “heat dissipation fan” is for the purpose of illustrating environmental structures only and forms no part of the claimed design.