FIG. 1 is a right perspective view of a gas fireplace embodying our new and ornamental design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a right side elevation thereof with it being understood that the left side elevation is a mirror image of the right side elevation;

FIG. 4 is a rear elevation thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The cross-hatching in FIG. 1 and 2 represents screening and is understood to extend uniformly throughout the areas represented.