Patent ID: 6893252

Claim:
A burner for the combustion of fuel gas in a furnace, said burner comprising: (a) a burner tube having a downstream end, and having an upstream end, said burner tube having a venturi therein; (b) a fuel spud located adjacent the upstream end of said burner tube, for introducing fuel gas into said burner tube; (c) a burner tip mounted on the downstream end of said burner tube adjacent a first opening in the furnace; (d) at least one passageway having a first end and a second end adjacent the upstream end of said burner tube; (e) means for drawing flue gas from said furnace, through said passageway, in response to an inspirating effect of uncombusted fuel gas exiting the fuel spud, said uncombusted fuel gas flowing through said burner tube from its upstream end towards its downstream end; and (f) means for increasing the inspirating effect of uncombusted fuel gas exiting said fuel spud; whereby said means for increasing the inspirating effect of uncombusted fuel gas exiting said fuel spud is effective to increase the amount of flue gas drawn from the furnace as compared to a burner without said means for increasing the inspirating effect.