The Superior unique, clean burning design provides 99% heating efficiency, allowing you to operate the logs vent-free with the fireplace damper closed. With no venting required, there is no heat loss up the chimney. Plus heating with Superior gas logs means you'll never again be left in the cold with wet logs or without heat during a power outage. Includes Burner MNF24 and 2 Log Sets LMF24GTA LMF24GTB . Not included optional lava rock flame bed at its base available for purchase separately Model FM100 . Features Model # MNF24INM-LMF24GTA-LMF24GTB. BTUs 29,000 40,000. Remote Ready. Ignition Millivolt. Gas Type Natural Gas. Vent Type Vent Free. Burner Type Ember Bed. Viewing Style Front View. Log Material Cast Refractory. Heavy-duty grate for enhanced rugged appeal. Hand crafted with high definition bark and split wood details. Specifications Log Size 24 . Burner Size 24 . Minimum Fireplace Dimensions 32.5 W x 15.5 D x 28 H .