FIG. 1 is a front and right-side perspective view of the three-sided fireplace in accordance with my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a right side elevational view thereof; and,
FIG. 5 is a left side elevational view thereof.
The rear elevational view and bottom plan view of the three-sided fireplace are not shown and therefore form no part of the claimed design.
The broken lines in the figures are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.