Highly efficient and completely airtight, the Grand-I35 is the largest of the gas metal inserts, and is specifically designed to fit larger fireplace openings. Its energy-wise metal surround covers the gap between the insert and the fireplace opening. The dual variable speed fan increases efficiency even more by pushing the warm air out into your room. With seven ceramic fiber oak-style logs and glowing embers providing realism, and your choice of fronts and finishes, the Grand-I35 insert will make your fireplace the center of attention once again.