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 clean lines and 'all flame' configuration of the Flex 158DB means the entire viewing area is dedicated to the eye-catching flame, creating a harmonious blend of traditional style and contemporary design. One of the longest flames available in the Flex Series is created by using 3 of our ever-popular XL900 Burners. With an overall heating capacity of 2099ft2 this appliance is best suited to large open spaces - think hotel lobby, large open plan restaurants. Each burner holds 2.6 gallons of fuel, and can deliver a stunning flame for up to 14 hours.