Patent ID: 8201551
Filing Date: 2012-06-19
Classification: F23D,F24H,Y02B

Abstract:
1. A variable output gas forced air heater, comprising: a housing surrounding a combustion chamber within which fuel is burned, said combustion chamber having an air inlet and a discharge; a variable speed fan within said outer housing upstream of said combustion chamber, said fan having a plurality of fan blades producing an air output; wherein some of said air output from said fan is in flow communication with air inlet of said combustion chamber, moving through said combustion chamber and out said discharge end; a substantially sealed secondary chamber coupled to said housing; a burner tube having a fuel inlet in said secondary chamber and a burner head adjacent said air inlet of said combustion chamber; a fuel nozzle in said secondary chamber adjacent said fuel inlet of said burner tube, said fuel nozzle coupled to a fuel flow rate adjustment valve; and an air input orifice extending into said secondary chamber, said air input orifice located upstream from said combustion chamber and at least partially in line with said blades of said variable speed fan; wherein some of said air output from said fan blades is additionally in flow communication with said air input orifice, moving through said air input orifice and into said secondary chamber.