Empire Comfort Systems now offers its Breckenridge deluxe vent-free fireboxes with factory-installed refractory liners. With thick panels made from refractory concrete, the liners perfectly recreate the look and character of a masonry-lined fireplace. Available in 32-, 36-, and 42-inch models, these fireboxes accept any properly sized, certified vent-free burner and log set. Contact: www.empirecomfort.com.