Vehicle heating and ventilation system

Claim 1

IN AN ENGINE COOLING SYSTEM, AN AIR INTAKE BLOWER, A VOLUTE TYPE SCROLL HOUSING SAID BLOWER, A HEAT EXCHANGER ADAPTED TO RECEIVE ENGINE COOLANT, A HOUSING FOR SAID HEAT EXCHANGER, AND AN AIR DIFFUSION SYSTEM COUPLING SAID BLOWER HOUSING TO SAID HEAT EXCHANGER HOUSING, SAID AIR DIFFUSION SYSTEM COMPRISING A DIFFUSER SECTION COUPLED TO SAID BLOWER HOUSING, SAID DIFFUSER SECTION HAVING MINIMUM WALL DIVERGENCE IN A DIRECTION AWAY FROM SAID BLOWER HOUSING AND DISCHARGING INTO AN ABRUPTLY STEPPED EXPANSION CHAMBER, SAID EXPANSION CHAMBER BEING COUPLED AT ITS DISCHARGE END TO THE INTAKE OF SAID HEAT EXCHANGER HOUSING, SAID AIR DIFFUSION SYSTEM THEREBY BEING CONSTRUCTED AND ARRANGED TO PROVIDE MAXIMUM EFFICIENCY IN ENERGY CONVERSION FROM VELOCITY HEAD AT THE BLOWER DISCHARGE TO STATIC HEAD AT THE HEAT EXCHANGER, AND FLEXIBLE SEAL MEANS INTERPOSED BETWEEN THE OUTLET END OF SAID DIFFUSER SECTION AND THE INLET OF SAID EXPANSION CHAMBER TO THEREBY ISOLATE THE BLOWER VIBRATIONS FROM THE HEATEXCHANGER STRUCTURE, THE OUTLET END OF SAID DIFFUSER SECTION, THE INLET END OF SAID EXPANSION CHAMBER AND SAID FLEXIBLE SEAL LYING IN SUBSTANTIALLY COPLANAR RELATIONSHIP WHEREBY SAID FLEXIBLE SEAL CREATES SUBSTANTIALLY NO ENERGY LOSS IN THE SYSTEM.