Sierra Flame INS-FM Electric Insert Fireplace with Black Steel Surround Add new life to an existing wood or masonry fireplace with Sierra Flame’s stylish Flush Mount INS-FM Electric Insert. The stunning and life-like ‘gradient’ flame is intensified by the visually impressive traditional log set, included with your insert. Finished with a black steel surround, the versatile design of this insert will work with any décor style.