The CFX-Diamond fireplace from Heat-N-Glo is the first diamond-shaped direct vent fireplace in the industry. Featuring CFX Technology, is has a ceramic fiber firebox that acts as a great insulator and allows higher Btu and a more robust fire. The direct vent design has an air-tight combustion chamber that takes all of its combustion air from outside. Direct vents also keep the warm air in and the cold air out. Situated higher on the wall, the CFX-Diamond opens new applications for fireplace placement.