Crescent Hill Vent Free 18″ Gas Logs with Millivolt Control – LP Crescent Hill Vent Free Gas Logs Cast refractory Vent Free Log Set Includes: 6 Gas Logs and Burner System Only. BTUs: 19,000 – 36,000. Fuel Type: Liquid Propane. Dimensions: 18″ (L). Minimum Firebox Dimensions: 24″(Front Width) x 20 1/2″(Back Width) x 13 1/2″(D). Realistic Six Piece Ceramic Fiber Logs. Innovative Dual Stainless Steel Burner . Features Three Beautiful Yellow Flames . Remote Control Ready. Warranty: 4 Years Limited Labor Allowance. Note: Please see related products for optional remote controls, such as S1001 or 3301 or S5001 or S5301 for Millivolt Valve.