The zero-clearance Flex Island fireplace insert is designed as a room divider, with four open sides enabling the hypnotic flame to be viewed from the front, back, left and right sides. The UL Listed Flex Island models come with a base component that holds the burner and a top component that lines the bulkhead above. The Flex 68IL.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.