Heritage Char Vent Free 18″ Gas Logs with Manual Valve – NG Heritage Char Vent Free Logs Fireside Collection Ceramic Fiber Gas Log Sets Includes: 10 Gas Logs and Burner System Only. BTUs: 30000. Fuel Type: Natural Gas. Dimensions: 18″ (L). Minimum Firebox Dimensions: 28″(Front Width) x 21″(Back Width) x 12″(D). Realistic Hand Molded, High Heat Refractory Logs Provide Enhanced Realism with . Hand Applied Deluxe Multi-Finishes. Features Large Ember Bed Enhanced with Platinum Bright Embers, Providing The . Look of Real, Undulating, Wood Burning Coals. Dual, Three Flame Aluminized Steel Burner Available with Manual Capreci, Millivolt SIT, Or Variable Maxitrol Valve. Dual Approval Listing for Both Vented & Vent Free Use. Warranty: Lifetime on Logs; 5 Years on Burner; 2 Year on Valves.