a fuel burner assembly for providing a stable , non - pulsating flame wall proximate to a burner duct outlet thereof including structure which causes a combustion air stream to flow radially outwardly and then inwardly across a fuel supply outlet and spaced igniter centrally positioned adjacent the duct outlet , the stream then being divided into three flow paths , one path being axial , another being centrally rotated and a third being annularly compacted to stabilize the produced flame wall proximate the duct outlet .