Heating and ventilating system for a vehicle

Claim 1

IN A VENTILATING SYSTEM FOR A VEHICLE HAVING SIDE AND END WALLS, A CEILING, A FLOOR, AND DOORS IN THE SIDE WALLS, DUCTS EXTENDING ALONG THE INTERSECTION OF THE SIDE WALLS AND FLOOR, A PARTITION ALONG THE OPPOSITE SIDE WALLS DEFINING THEREWITH AN ELONGATED AND SHALLOW AIR PASSAGEWAY, EACH PARTITION BEING ARRANGED TO PROVIDE INTERCOMMUNICATION BETWEEN THE CORRESPONDING DUCT AND LOWER END OF THE CORRESPONDING AIR PASSAGEWAY, EACH PARTITION TERMINATING UPWARDLY OF ITS CORRESPONDING DUCT TO DEFINE WITH THE CORRESPONDING SIDE WALL AN AIR OPENING FOR DISTRIBUTION OF AIR INTO SAID VEHICLE, A BLOWER UNIT MOUNTED ON THE OUTSIDE OF THE VEHICLE HAVING AN AIR INLET AND AN OUTLET, MEANS CONNECTING THE OUTLET TO SAID DUCTS, MEANS CONNECTING THE INLET TO AN OPENING TO ATMOSPHERE AND AN OPENING TO THE INTERIOR OF SAID VEHICLE, A DAMPER BETWEEN THE OPENING TO THE ATMOSPHERE AND THE OPENING TO THE INTERIOR FOR CONTROLLING THE AMOUNT OF ATMOSPHERIC AIR SUPPLIED TO THE BLOWER UNIT INLET, MEANS FOR CONTROLLING THE TEMPERATURE OF THE AIR DISCHARGED FROM SAID AIR OPENING, A CIRCULATING FAN MOUNTED ON SAID CEILING HAVING AN INLET AND OUTLET WITHIN SAID VEHICLE, AND A DAMPERED OPENING IN THE CEILING COMMUNICATING WITH THE ATMOSPHERE, WHEREBY SAID FAN CIRCULATES AIR WITHIN THE VEHICLE WHEN THE DAMPER IS CLOSED AND EXHAUSTS AIR FROM WITHIN THE VEHICLE WHEN THE DAMPER IS OPEN, AND SAID BLOWER UNIT BEING OF SUCH CAPACITY AS TO MAINTAIN A POSITIVE PRESSURE WITHIN THE VEHICLE EVEN WHEN SAID DAMPERED OPENING IS OPEN.