Patent ID: 6893251

Claim:
A staged-air burner for use in a furnace having a furnace floor, said staged-air burner being located adjacent a first flame opening in the furnace floor, said staged-air burner comprising: (a) a burner tube including (i) a downstream end, (ii) an upstream end for receiving fuel and air, flue gas or mixtures thereof from a primary air chamber, and (iii) a bumer tip mounted on the downstream end of said burner tube and directed to the first flame opening in the furnace, so that combustion of the fuel takes place downstream of said burner tip; (b) a secondary air chamber for supplying a second portion of combustion air, said secondary air chamber in fluid communication with at least one air port; and (c) a wall perpendicularly disposed in relation to the furnace floor and extending into the furnace, said wall peripherally surrounding said burner tip to provide a substantial barrier between a base of a flame at said burner tip and said at least one air port.