Lively flames with a large ember bed are features of the G18 Natural Gas Vent Free Burner System - 24"/30". This burner will add efficient heat and unmatched beauty to your fireplace. This burner features three seperate flames for added realism. Available variable Remote for this 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. The burner comes with a pre-assembled flex hose for ease of installation and added safety. 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 30" - 36" x Rear Width 20"-26" x Depth 14" x Height 18"