Patent ID: 8721410
Filing Date: 2014-05-13
Classification: F24F

Abstract:
1. Wall sleeve between an inside and an outside of a wall ( 4 ), comprising: a guide tube ( 2 ); a ventilation opening at an end of the guide tube ( 2 ); and a cover plate ( 5 ), which is mounted at the end of the guide tube and can be moved by a pressure difference of an airflow between a closing position and an open position, at an inside of which is formed a hyperbolically shaped air stream body ( 6 ), characterized in that the cover plate ( 5 ) is conducted along a central axis on guide arms ( 7 ) in the guide tube ( 2 ), and an air baffle ( 15 ) streamlined as a funnel shaped ring is mounted on said cover plate ( 5 ), wherein the funnel shaped ring of the air baffle ( 15 ) at first runs parallel to a central axis of the guide tube ( 2 ) on the inside, and then widens in such a way that the airflow is deflected outwards by approximately 70° in relation to the central axis, and the cover plate ( 5 ) automatically opens and closes against a reset force, propelled by the pressure difference between an air pressure in the guide tube ( 2 ) and an external ambient air thereby leading the air flow to a rim of the cover plate ( 5 ) and to the outside.