With two open sides, Flex Double Sided fireplace insert creates the perfect room divider. The see-through design provides unobstructed views of the flickering flame from the front and the back, infusing warmth and ambiance into two adjacent rooms. The Flex 68DB.BX2 includes a design that features Decorative Boxes on either side of the firebox. This 2 Box-design boasts an attractive visual symmetry while the glass panels that divide the Decorative Boxes and the Firebox create an uninterrupted, streamlined look. The XL500 burner, the 'baby' of the XL Series, delivers a stunning, long-lasting linear flame. It may be compact in size, but with a 1.3 gallons capacity, this ethanol burner can heat up to 431ft2. Efficiency is a key feature of this burner, delivering up to 13 hours of heat generating flame off a single refill.