Suburban Furnace Burner Orifice 180231 (NT Series) Compatibility: Suburban Furnace NT12LEC/ NT16LEC/ NT20LEC/ NT20S/ NT16LE/ NT16S/ NT20L/ NT20SE/ NT20SQ/ NT20SEQ This orifice will take your 16k BTU unit to a 20K BTU unit! Features Limited 90 Day Warranty