As the medium-sized of the three gas metal inserts, our Supreme-XTS is specifically designed to fit most fireplace openings. Highly efficient and completely airtight, its energy-wise metal surround covers the gap between the insert and the fireplace opening. The 160 cfm fan in this unit increases the efficiency even more by pushing the warm air out into your room. With six ceramic fiber logs providing realism and your choice of finishes and fronts, our medium insert will make your fireplace the center of attention once again.