Patent ID: 6622661
Filing Date: 2003-09-23
Classification: F23L,F23M,F24H

Abstract:
Fuel-fired heating apparatus having top and bottom portions and comprising:a combustion chamber; a burner structure operative to create hot combustion products within said combustion chamber; a vent structure having an inlet portion communicated with said combustion chamber, and a discharge portion disposed adjacent said top portion of said heating apparatus, said vent structure being operative, during firing of said heating apparatus, to create a draft that draws the created hot combustion products through said vent structure toward said discharge portion thereof; and a flammable vapor control system for substantially preventing entry into and combustion within said combustion chamber of extraneous flammable vapors externally adjacent said bottom portion of said heating apparatus, without detecting the extraneous flammable vapors or terminating firing of said heating apparatus, said flammable vapor control system including: a dilution air flow passage coupled to said discharge portion of said vent structure, isolated from direct communication with said combustion chamber, and having an inlet portion positioned externally adjacent said bottom portion of said heating apparatus, said dilution air flow passage functioning, during firing of said heating apparatus, to draw dilution air and said extraneous flammable vapors into said discharge portion of said vent structure for discharge therefrom, and a combustion air flow passage having an inlet disposed in an elevated relationship with said bottom portion of said heating apparatus, and an outlet communicated with said combustion chamber.