Ventilating device for spaces in building

Claim 1

A VENTILATION UNIT COMPRISING A HOUSING ADAPTED TO BE MOUNTED ON THE INSIDE OF A WALL OF A ROOM TO BE VENTILATED ASSOCIATED WITH A WALL OPENING DEFINED IN SAID WALL, SAID HOUSING HAVING A FRESH AIR INTAKE OPENING EXTENDING OVER A FIRST PART OF THE CROSS SECTIONAL AREA OF SAID WALL OPENING, AN OUTLET OPENING FACING AND OPENING INTO THE INTERIOR OF SAID ROOM, A SEPARATION WALL DEFINING A FIRST AIR PASSAGE BETWEEN SAID FRESH AIR INTAKE OPENING AND SAID OUTLET OPENING AND EXTENDING INTO SAID WALL OPENING, AN EXHAUST OPENING EXTENDING OVER A SECOND PART OF THE CROSS SECTIONAL AREA OF SAID WALL OPENING, AN INLET OPENING FACING AND OPENING INTO THE INTERIOR OF SAID ROOM AND ARRANGED IN SAID HOUSING REMOTE FROM SAID OUTLET OPENING, SAID SEPARATION WALL ALSO DEFINING A SECOND AIR PASSAGE BETWEEN SAID EXHAUST OPENING AND SAID INLET OPENING, A BLOWER HAVING A HIGH PRESSURE SIDE AND A LOW PRESSURE SIDE MOUNTED IN SAID SECOND AIR PASSAGE FOR DRAWING A STREAM OF AIR FROM SAID INLET OPENING TO AND OUT OF SAID EXHAUST OPENING, SAID SEPARATION WALL INCLUDING A PORT COMMUNICATING WITH SAID FIRST AND SECOND AIR PASSAGES ON SAID HIGH PRESSURE SIDE OF SAID BLOWER, AND ADJUSTABLE VALVE MEANS WITHIN SAID PORT, SAID OUTLET OPENING DIRECTING AIR EJECTED THEREFROM AWAY FROM THE AIR STREAM ENTERING SAID INLET OPENING.