The ornamental design for a horizontalventilationwindow for car seat canopy, as shown and described.
FIG. 1 is a perspective front view of a horizontal ventilation window for car seat canopy shown on a carrier;
FIG. 2 is a perspective front view of the horizontal ventilation window for car seat canopy;
FIG. 3 is a front elevation view of the horizontal ventilation window for car seat canopy;
FIG. 4 is a rear elevation view of the horizontal ventilation window for car seat canopy;
FIG. 5 is a left elevation view of the horizontal ventilation window for car seat canopy;
FIG. 6 is a right elevation view of the horizontal ventilation window for car seat canopy;
FIG. 7 is a top elevation view of the horizontal ventilation window for car seat canopy; and,
FIG. 8 is a bottom elevation view of the horizontal ventilation window for car seat canopy.
The broken line showing of portions of the claimed design is included for the purpose of illustrating environmental structure and forms no part of the claimed design.