The side burner model HG-S is equipped with a side air burner ceramic or metal air nozzle. The air nozzle block protects the metal burner parts from the back reflections of the furnace chamber. When the air nozzle is optimally designed, a stable flame pattern is safely ensured over a control range of approx.12:1. The flames themselves are insensitive to large air surges. This is only an advantage during commissioning.