Recirculating exhaust fan and heat unit

Claim 1

IN A VENTILATING SYSTEM FOR A VEHICLE HAVING SIDE AND END WALLS, A CEILING AND ROOF THEREOVER, A FLOOR AND DOORS IN THE SIDE WALLS DEFINING A PASSENGER COMPARTMENT, A CIRCULATING AND EXHAUST FAN UNIT GENERALLY MOUNTED BETWEEN THE CEILING AND ROOF, SAID FAN UNIT COMPRISING A HOUSING, A FAN MOUNTED IN SAID HOUSING FOR ROTATION IN A PLANE GENERALLY PARALLEL TO SAID CEILING AND ROOF, AN AIR INLET AND AN AIR OUTLET TO SAID HOUSING COMMUNICATING THROUGH THE CEILING WITH THE PASSENGER COMPARTMENT, EXHAUST OPENING MEANS IN THE HOUSING COMMUNICATING THROUGH THE ROOF WITH THE ATMOSPHERE, RAIN ELIMINATING MEANS MOUNTED BELOW THE ROOF AND ADJACENT THE EXHAUST OPENING MEANS TO COACT THEREWITH AND PREVENT RAIN FROM ENTERING SAID HOUSING, DAMPER MEANS WITHIN SAID HOUSING FOR SELECTIVELY OPENING AND CLOSING SAID EXHAUST OPENING MEANS, AND AN ARCUATE DEFLECTING BAFFLE ARRANGED ABOVE THE FAN, THE AIR OUTLET AND A PART OF THE AIR INLET FOR DEFLECTING A PORTION OF THE AIR RECEIVED THROUGH SAID AIR INLET OUT AND THROUGH SAID AIR OUTLET, WHEREBY SAID FAN UNIT CIRCULATES AIR WITHIN THE PASSENGER COMPARTMENT WHEN THE DAMPER MEANS IS CLOSED AND EXHAUSTS A PORTION OF THE AIR FROM SAID COMPARTMENT THROUGH SAID EXHAUST OPENING MEANS WHEN THE DAMPER MEANS IS OPEN.