We needed to remove an obsolete gas fireplace so selected this one in the largest size to fit the existing space vacated by the old unit as close as possible.  There was a four inch gap in height, and one inch in width. Our contractor designed the frame around the edge to mask a couple chips in the ceramic tile surround as well as fill the gaps.  We are really loving the look of the new fireplace whether off or on, and the heat setting gives us the cozy feeling of a real fireplace without the mess of one.  We chose the traditional log look, but the unit arrives with three choices which easily change out. There was a flimsy metal curtain installed on the glass face as if there were embers to protect from, but we easily removed it and prefer the look without that.   Packing was a double carton and arrived without issue.  Easy to install.  Loving it!