Inserts are specially designed to fit into the opening of an existing metal (zero clearance) or masonry fire-place. Essentially, an insert is composed of a metal housing that contains the fire, ceramic glass windows, a faceplate (usually decorative) that covers the junction between the firebox and the edge of the existing fireplace cavity, and an air intake and exhaust system.
At Firestarter's Custom Fireplaces & Stoves, Inc., we specialize in insert installation and service.