FIG. 1 is a front perspective view of humidifier showing a first embodiment of our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a right hand side elevation view thereof;
FIG. 5 is a left hand side elevation view;
FIG. 6 is a rear elevation view;
FIG. 7 is a front perspective view of humidifier showing a second embodiment of our new design;
FIG. 8 is a top plan view thereof;
FIG. 9 is a front elevation view thereof;
FIG. 10 is a right hand side elevation view thereof;
FIG. 11 is a left hand side elevation view;
FIG. 12 is a rear elevation view.
FIG. 13 is a front perspective view of humidifier showing a third embodiment of our new design;
FIG. 14 is a top plan view thereof;
FIG. 15 is a front elevation view thereof;
FIG. 16 is a right hand side elevation view thereof;
FIG. 17 is a left hand side elevation view;
FIG. 18 is a rear elevation view;
FIG. 19 is a front perspective view of humidifier showing a fourth embodiment of our new design;
FIG. 20 is a top plan view thereof;
FIG. 21 is a front elevation view thereof;
FIG. 22 is a right hand side elevation view thereof;
FIG. 23 is a left hand side elevation view; and,
FIG. 24 is a rear elevation view.
The bottom view of the embodiments form no part of the claimed design. The subject matter shown in broken lines forms no part of the claimed design.