Patent ID: 6884062

Claim:
A burner for use in a furnace, said burner being located within a first flame opening in the furnace, said burner comprising: (a) a primary air chamber; (b) a burner tube including (i) a downstream end, (ii) an upstream end in fluid communication with said primary air chamber, and (iii) a burner tip mounted on the downstream end of said burner tube and directed to the first flame opening in the furnace, so that combustion of fuel takes place downstream of said burner tip; (c) at least one flue gas recirculation duct having a first end at a second opening in the furnace and a second end opening into said primary air chamber, said first end being spaced an effective distance from said first opening for minimizing entrainment of a burner flame into said second opening; and (d) a wall extending into the furnace between said first flame opening and said first end of said flue gas recirculation duct to substantially lengthen a flow path therebetween and thereby provide a substantial barrier to flow.