FIG. 1 is a top, right side perspective view of a new, original and ornamental design for a handle for blow dryer;
FIG. 2 is a right side elevation view of FIG. 1;
FIG. 3 is a left side elevation view of FIG. 1;
FIG. 4 is a front elevation of FIG. 1;
FIG. 5 is a rear elevation view of FIG. 1;
FIG. 6 is a top plan view of FIG. 1; and,
FIG. 7 is a bottom plan view of FIG. 1.
The broken lines in the drawings depict portions of the handle for blow dryer that form no part of the claimed design. The broken lines in the drawings further depict a barrel portion of a blow dryer and power cord connected to the handle as environmental subject matter that form no part of the claimed design.