The G45 and GX45 Burner Systems are listed or ANSI Certified (with controls preassembled at the factory) and accentuate the front flame and ember bed of the log set. Compatible with most Real Fyre® log styles and control options, these burner systems are available in Natural or Propane gas and can be ordered as a see-thru, peninsula and island fireplace, or stainless steel model.GX45 includes a heavy-duty grate Stainless steel model only available for the G45 burner. Versatile burner with high BTU capacity and sizes up to 60.