The ornamental design for an environmental enclosure for a vending machine, as shown and described.
FIG. 1 is a front view of an environmental enclosure for a vending machine according to the present design;
FIG. 2 is a top plan view of the environmental enclosure for a vending machine of FIG. 1; and,
FIG. 3 is a left side elevational view of the environmental enclosure for a vending machine of FIG. 1, the right side being a mirror image.
The bottom view and rear view of the environmental enclosure for a vending machine have been omitted since they are unormamated and do not form part of the claimed design.