Room ventilating apparatus

Claim 1

A VENTILATOR FOR A ROOM HAVING AN OPENING IN A WALL THEREOF NEAR THE ROOM FLOOR, COMPRISING A CLOSED CASING TO BE POSITIONED OUTSIDE SAID ROOM WALL OVER THE OPENING THEREIN, SAID CASING HAVING AN INLET THEREIN ADAPTED TO REGISTER WITH THE WALL OPENING AND OPENING MEANS BELOW THE LEVEL AND OUTWARDLY OF SAID INLET AND THROUGH WHICH AIR MAY BE DISCHARGED FROM THE CASING TO THE ATMOSPHERE OUTSIDE THE ROOM WALL, A FLAP SWINGABLY MOUNTED AND HANGING IN THE CASING OVER THE INLET THEREOF, SAID FLAP BEING BALANCED NORMALLY TO AN OPEN POSITION INCLINED AWAY FROM THE INLET AND EXTENDING GENERALLY TOWARD SAID OPENING MEANS TO PERMIT AIR TO FLOW OUT OF THE ROOM THROUGH THE INLET AND OUT THROUGH THE OPENING MEANS, AND BAFFLE MEANS IN THE CASING FOR DIRECTING OUTSIDE AIR ENTERING THE CASING THROUGH SAID OPENING MEANS AGAINST THE FLAP, SAID BAFFLE MEANS COMPRISING A FIRST BAFFLE MOUNTED AND EXTENDING UPWARDLY IN THE CASING BELOW THE FLAP BETWEEN THE LATTER AND THE OPENING MEANS FOR DIRECTING AIR ENTERING THROUGH SAID OPENING MEANS UPWARDLY IN THE CASING AND AWAY FROM THE FLAP AND THE INLET, AND A SECOND BAFFLE IN THE CASING ABOVE AND EXTENDING OVER THE FIRST BAFFLE TOWARDS THE FLAP TO DIRECT ALL AIR FROM SAID FIRST BAFFLE AGAINST THE FLAP, WHEREBY SAID FLAP IN ITS NORMALLY INCLINED POSITION DIRECTS GENTLY FLOWING OUTSIDE AIR BACK TO AND THROUGH THE OPENING MEANS TO SUCK AIR THROUGH THE INLET FROM THE ROOM AND IS SWUNG TO CLOSE THE INLET BY A STRONG FLOW OF OUTSIDE AIR AS SAID FLAP DIRECTS THE LATTER AIR TO THE OPENING MEANS.