White Mountain Sassafras Vent Free 24″ Gas logs, Millivolt with On/Off switch – Propane. 6 Piece Sassafras Log Set. With Slope Glaze Burner. Refractory Logs Are Hand-Painted To Bring Out The Rich Detail. Exceptionally Realistic Flame Movement. Approved For Vented And Vent Free Use. Fuel type: Liquid Propane. BTUS: 36,000. Please measure your firebox size before placing order …