Patent ID: 6923173

Claim:
A hot air furnace comprising: a. a heat exchanging chamber wherein comfort air is heated by being forced through the chamber; b. a blower for urging comfort air through the heat exchanging chamber, c. a heat exchanger assembly located in the heat exchanging chamber and in heat exchanging contact with comfort air passing through the heat exchanging chamber, said heat exchanger comprising: i. a combustion member including a substantially cylindrical wall portion, wherein the combustion member communicates with a burner, further wherein an insulating material is affixed to the inside of the cylindrical wall portion, ii. a condenser portion positioned in the flow path of comfort air upstream from the combustion member in the heat exchanging chamber, iii. a transfer member connected to the end of the combustion member opposite of the burner and to providing a path for combustion gases from the combustion member to the condenser, iv. a diffuser member mounted within the combustion member wherein the diffuser is positioned in the combustion member to inhibit the flame generated by the burner from extending into the transfer member, and d. wherein the burner includes a combustion air blower which urges combustion gases through the heat exchanging assembly to an exhaust outlet.