Sky Large Room DividerSky Large Tunnel Fireplace Real Flame Burner, Double burner Natural gas (min max): 15,000 44,000 BTU Propane (min max): 11,000 36,000 BTU Efficiency: 89% Real Flame Burner With the Real Flame Burner you are assured of an extremely realistic fire image. In combination with the true to nature cleaved wood logs, this creates a beautiful wood fire. Double burner The double burner guarantees a beautiful fire experience because the fire is spread over the