Method and apparatus for powered flue products exhaust and preheated combustion air supply

In a combination powered flue products exhaust and preheated combustion air supply assembly for use in association with a heating furnace comprising:

• (a) a compartmented main housing, said main housing defining a combustion air supply compartment and flue products exhaust compartment therein, said combustion air supply compartment provided with a combustion air intake fan mounted therein and said flue products exhaust compartment provided with a flue products exhaust fan mounted therein;
• (b) a double-shafted drive motor mounted in said main housing so as to simultaneously drive said combustion air intake fan and said flue products exhaust fan;
• (c) an outside air intake pipe provided on said main housing in open communication with said combustion air supply compartment, said outside air intake pipe configured to extend to the exterior of the building in which it is mounted so as to provide outside air to said combustion air supply compartment;
• (d) a combustion air supply duct provided on said main housing in open communication with said combustion air supply compartment, said combustion air supply duct configured to convey combustion air to the furnace area;
• (e) a flue products exhaust supply duct provided on said main housing in open communication with said flue products exhaust compartment, said flue products supply duct connected to the flue products exhaust outlet of the furnace so as to deliver hot flue exhaust products therefrom to the said flue products exhaust compartment;
• (f) a flue products exhaust pipe provided on said main housing in open communication with said flue products exhaust compartment, said flue products exhaust pipe concentrically mounted within said air intake pipe so as to extend therethrough to the exterior of the building to deliver the hot flue products to the outside atmosphere, said flue products exhaust pipe adapted to transmit heat from hot flue exhaust products passing outwardly therethrough to preheat combustion air passing inwardly through said air intake pipe;
• and
• (g) automatic air pressure controlled dampers provided in said combustion air intake pipe and said flue products exhaust pipe so as to selectively close said intake air and flue products exhaust pipes when said fans are not running.