Large Flush Wood Hybrid-Fyre Insert with Single Rectangular Door This large fireplace insert features the exclusive clean burning Hybrid-Fyre Technology. Hybrid Technology is a fusion of known wood combustion (kiln fired firebrick, stainless baffles, and stainless steel secondary combustion air tubes, with the addition of our catalytic assist technology. Primary combustion burn occurs in the firebox with our secondary tubes re-burning gases before they leave the firebox, we are then making those same gases pass through a catalytic combustor leaving virtually no smoke to exit the appliance. The net result of this is a super clean burning insert, with emissions of just .58 grams per hour. Also with that reduction in emissions comes almost zero carbon mononxide remaining through all burn cycles. We are taking clean burning to an unmatched level of efficiency. Our overall efficiency for this Large Flush Wood Hybrid-Fyre Insert is over 80%. What this means is more heat from less wood, and greater savings on your heating cost! This insert will heat up to 2,500 sq feet, with up to 10 hour burn times. The large fire box is 3.0 cubic feet in size and will accommodate a 24” log. We have engineered this Large Hybrid Flush Insert so that it will indeed fit into many fireplace openings and is approved for both masonry and zero clearance fireplaces and also features a bypass damper for smoke free firestarting and reloading. Now with GreenStart Option. GreenStart is a patent-pending ignition system for the modern wood burner; just load your wood and push a button! We've completely eliminated slow, cracked open door startups and laboring over fickle newspaper.