Combined furnace and heat recovery system

A combined furnace and air recovery system comprising:

• a furnace housing having an inlet opening for connection to a cold air return duct and an outlet opening connected to a heating duct;
• a negative pressure compartment located within said housing and in communication with said inlet opening for receiving stall air from said inlet opening;
• a positive pressure compartment located within said housing and in communication with said outlet opening;
• a single fan unit communicating between said negative pressure compartment and said positive pressure compartment thereby creating negative pressure in said negative pressure compartment and positive pressure in said positive pressure compartment;
• a heating means located within said positive pressure compartment;
• and
• an air-to-air heat exchange unit having first and second air flow paths;
• wherein said first air flow path connects an exterior inlet duct to said negative pressure chamber for mixing with said stall air from said inlet duct to provide a supply of fresh air to said negative pressure chamber and said second air flow path connects said positive pressure chamber to an exterior outlet duct to provide for exhausting stale air from said positive pressure chamber.