The Lopi DVL GSR GreenSmart Direct Vent Large insert will turn your inefficient fireplace into a convenient source of gas heat. With the combination of convective heat, radiant heat and reduced depth dimension this insert is ideal for medium to large masonry or(ZC)metal fireplaces. The DVL GSR GreenSmart insert is perfect for zone heating in large rooms such as living rooms, great rooms and mid-sized living spaces (Heats up to 2,000 sq. ft.).