Lively flames with a large ember bed are features of the G10 Natural Gas Vent Free Burner System - 16"-18". This burner will add efficient heat and unmatched beauty to your fireplace. This burner features three separate flames to compliment the burned through design of specific logs, the ember bed has a T shape that impinges upon the logs and gives the illusion of a smoldering front log. Available with variable remote control for natural gas system. This vent free gas log set operates on natural gas with the chimney flue closed, and is an efficient heat source because 100% of the heat generated stays in your home. This burner's stainless steel flex connector comes pre-assembled for ease of installation and increases the safety of the product. Vent-free burners add moisture to the air, so it's important to install them in a room with proper ventilation to avoid formation of mildew. Please Note: Before installing any gas burner system, check your local and state codes. Minimum Firebox Dimensions Front Width 22" x Rear Width 20" x Depth 12" x Height 17"