The ornamental design for a hairdryerconcentrator, as shown and described.
FIG. 1 is a perspective view of a hair dryer concentrator, showing our new design;
FIG. 2 is a front elevation view of FIG. 1;
FIG. 3 is a rear elevation view of FIG. 1;
FIG. 4 is a left side elevation view of FIG. 1;
FIG. 5 is a right side elevation view of FIG. 1;
FIG. 6 is a top plan view of FIG. 1; and,
FIG. 7 is a top plan view of FIG. 1.
The broken lines in the drawings depict portions of the hair dryer concentrator that form no part of the claimed design. The broken lines in the drawings showing a hair dryer handle depict environmental subject matter that form no part of the claimed design.