With its sleek lines, wide variety of choices for accessorizing, and beautiful polished mirror finish the G21 is the perfect addition to any contemporary heart. See-Thru G21 is the latest in Vent Free technology! Features: Burns cleanly with glass/gems directly on the burner ports providing a beautiful sea of flames Available in 24″ (G21-GL-2-24-12) Available in Natural Gas or Propane Certified to ANSI standards