Patent ID: 6273813
Filing Date: 2001-08-14
Classification: A01K,E06B,F24F

Abstract:
A ventilation apparatus for arranging in a wallsurface region of a building to be utilized essentially for agricultural purposes, which ventilation apparatus comprises at least one tarpaulin-like wall element (1), which, for ventilation through the wall surface, is to be opened more or less wide for passage of air, wherein the wall element (1) hangs on a tension member (3, 5, 7, 17), and is fixed with its bottom margin to a winding shaft (9) in such a way that it can be wound, the winding shaft (9) being drivable by means of a winding drive (10), and wherein the tension member (3, 5, 7, 17) can be actuated in synchronism by means of the same winding drive (10) for winding and unwinding the wall element (1) and for simultaneously lowering and lifting the top margin of the wall element (1).