24 7 Piece Kentucky Wildwood high definition refractory log only for natural blaze VF 24 burner.Certifications: CSA Design Fuel Type: Liquid Propane or Natural Gas Hearth Dimensions: 31W x 17H x 13D x 25-1 4RW Heating Capacity: Up to 1400 sq ft Ignition System: SCS or Millivolt Max BTU H: 37,000 NG 36,000 LP Size: 24 Venting: Vent Free Weight: 27.65