The Cascade LEcan be installed in a masonry or factory-built (zero-clearance) fireplace with the use of a 6" flue liner and is capable of heating 2,600 square feet or more. Our Kuma Cascade LE insert will upgrade your fireplace into an exceptionally efficient home heating center. Enjoy the fire while savoring the knowledge that its beauty is providing a clean-burning, efficient and economical comfort. Guaranteed for a lifetime of service, the Kuma Cascade LE is truly an excellent choice for your fireplace insert.