The ornamental design for a kitchenventilator, as shown and described.
FIG. 1 is a bottom perspective view of a kitchen ventilator according to my new ornamental design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is a right side view thereof.
The broken lines represent environment or structure and do not form any part of the claimed design.
The dotted lines in FIG. 4 delineate an opening and/or indicate the border between claimed, exterior subject matter and unclaimed, interior feature(s), and do not form any part of the claimed design.