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 Crescent Hill Log Set Only Features Model # LVD24CH. LOGS ONLY Crescent Hill Log Set. BTU 19,000 36,000. Fuel Type Gas. View Style Front View. Venting Type Vent-Free. Log Material Cast Refractory. Control Type Manual or Millivolt. For use with VD1824 Vent Free Burner System by Superior Fireplaces. Warranty 3 Year Limited Warranty. Specifications Log Size 24 . Minimum Fireplace Dimensions 28 W x 13.5 D x 17 H . Burner is shown in image, however not included in this product.