The Large Flush Wood Hybrid-Fyre™ Insert from FireplaceX is the cleanest burning, most efficient, large wood insert in the world! This insert burns so clean that it produces only 0.58 grams of emissions per hour and tests at over 80% efficiency. Its revolutionary Hybrid-Fyre™ technology is what makes for an incredibly clean burn that emits virtually no smoke or carbon monoxide, all while saving you money and trips to the wood pile. The Large Flush Wood Hybrid-Fyre™ Insert is approved to fit large zero clearance and masonry fireplaces with its 19 inch depth and 3 cubic foot firebox. It features a huge fire viewing area that comes available with decorative rectangular and arched door options. It also includes concealed twin 90 CFM convection fans that powerfully heat up to 2,500 square feet, while producing burn times of up to 12 hours. Photo by Travis Industries.