Patent ID: 6382203
Filing Date: 2002-05-07
Classification: F04D,F23D,F23L,Y02E

Abstract:
A fuel-fired, forced draft heating appliance comprising:a chamber having an exterior wall with an air intake opening therein; a heat exchanger; a fuel burner disposed in said chamber and operative to create hot combustion products in said heat exchanger; a draft inducer fan disposed in said chamber, having a motor, and being operative to forcibly expel flue gas from said heat exchanger; and an air transfer structure extending through said chamber, having an interior flow passage, and being interconnected between said air intake opening and said motor, operation of said draft inducer fan creating within said chamber a negative pressure that draws combustion air into said chamber, for delivery to said fuel burner, sequentially through said air intake opening, through said interior flow passage, and against said motor in a manner cooling said motor and being preheated by said motor prior to delivery to said fuel burner.