Door air screen

Claim 1

A DOOR AIR SCREEN FOR USE ON A WALL OVER A DOORWAY COMPRISING A HOUSING HAVING A VERTICAL FRONT PANEL, A VERTICAL REAR PANEL, A PAIR OF VERTICAL SIDE PANELS AND BEING OPEN AT THE TOP AN BOTTOM, MEANS FOR SECURING SAID REAR PANEL TO SAID SIDE WALL, A DIAPHRAGM PLATE EXTENDING HORIZONTALLY ENTIRELY ACROSS SAID HOUSING AND DIVIDING SAID HOUSING INTO AN UPPER COMPARTMENT AND A LOWER COMPARTMENT, SAID DIAPHRAGM PLATE HAVING A PAIR OF CIRCULAR OPENINGS THEREIN AFFORDING COMMUNICATION BETWEEN SAID UPPER COMPARTMENT AND SAID LOWER COMPARTMENT, MEANS ON SAID DIAPHRAGM PLATE CYLINDRICAL SHROUDS AROUND SAID OPENINGS AND DEPENDING INTO SAID LOWER COMPARTMENT, SUPPORTS EXTENDING INTO SAID HOUSING AND SPANNING SAID OPENINGS, MEANS FOR RIGIDLY UNITING SAID DIAPHRAGM PLATE AND SAID SUPPORTS, ELECTRIC MOTORS WITHIN SAID UPPER COMPARTMENT AND RIGIDLY SECURED TO SAID SUPPORTS, FANS MOUNTED ON SAID MOTORS AND DISPOSED WITHIN SAID SHOURDS, MEANS FOR JOINING ADJACENT DEPENDING PORTIONS OF SAID SHROUDS, A PAIR OF PANELS EXTENDING ACROSS AND SUPPORTED IN SAID LOWER COMPARTMENT, EACH BEING DISPOSED BENEATH ONE OF SAID FANS AND EACH DEFINING VERTICAL AIR DIRECTING PASSAGEWAYS, MEANS FOR SUPPORTING SAID PANELS IN SAID HOUSING AT A VARIABLE LATERAL INCLINATION, A PLURALITY OF LOUVERS IN SAID LOWER COMPARTMENT BENEATH SAID PANELS, AND MEANS FOR SUPPORTING SAID LOUVERS IN SAID HOUSING AT VARIABLE LONGITUDINAL INCLINATION.