Patent ID: 7100356

Claim:
A heat recovery apparatus comprising: a housing having exterior walls, a hot airflow inlet, and an airflow outlet; an array of heat exchanging units mounted in said housing, each heat exchanging unit being adapted for heat exchange between a hot air flow and a heat exchanging liquid flowing through pipes of the heat exchanging unit; and a series of aerodynamic diffusers mounted in said housing in the region of the airflow inlet, a leading end of each diffuser relative to the direction of hot airflow in said housing during use of the apparatus having a rounded shape as seen in vertical cross-section, each diffuser having a leading front section which is wider than a rear end thereof, and said diffusers being mounted in a transition duct portion of said housing, wherein said aerodynamic diffusers redirect at least a substantial portion of hot air flow entering said housing through said airflow inlet during use of said apparatus in order that said hot air flow passes more uniformly through said heat exchanging units.