Multiple air screen for use with a doorway

Claim 1

A MULTIPLE AIR SCREEN FOR USE WITH A DOORWAY COMPRISING A FRAME HAVING A HORIZONTAL MEMBER EXTENDING ACROSS THE TOP OF SAID DOORWAY, A PAIR OF SUBSTANTIALLY INDENTICAL AIR MOVING UNITS, MEANS FOR MOUNTING SAID UNITS SOLELY ON SAID FRAME ON OPPOSITE SIDES THEREOF AND EXTENDING IN OPPOSITE DIRECTIONS ABOVE SAID DOORWAY SUBSTANTIALLY TO BALANCE EACH OTHER AND BEING THEREBY ENTIRELY EXPOSED EXCEPT FOR THE SIDE OF EACH OF SAID UNITS MOUNTED ON SAID FRAME, EACH OF SAID UNITS INCLUDING A HOUSING CLOSED ON THE SIDES AND OPEN AT THE TOP AND AT THE BOTTOM, A MOTOR WITHIN SAID HOUSING AND SUPPORTED THEREON WITH THE SHAFT OF SAID MOTOR VERTICAL, A FAN ON SAID SHAFT BELOW SAID MOTOR AND EFFECTIVE WHEN SAID MOTOR IS ENERGIZED TO INDUCE AIR TO FLOW INTO THE TOP OF SAID HOUSING AND TO FLOW OUT OF THE BOTTOM OF SAID HOUSING, MEANS ON AND ENTIRELY SUPPORTED ON SAID HOUSING BELOW SURFACE FOR DIRECTING AIR FROM SAID FAN TO FLOW DOWNWARDLY ON THE RESPECTIVE SIDE OF SAID DOORWAY WITH A COMPONENT DIRECTED AWAY FROM SAID DOORWAY, SAID UNITS BEING SPACED APART ON OPPOSITE SIDES OF SAID MEMBER TO LEAVE A DEAD AIR SPACED BETWEEN THE AIR FLOWING FROM SAID RESPECTIVE UNITS.