Commonly used name in Austria for the ventilation shaft that comes from the wine cellar leads up to the outside for ventilation; the end is called a roof pipe (see picture). The steam tube was also used to extract the fermentation gas generated during fermentation ( carbon dioxide ). The fermentation gas was also removed via the so-called Gärgitter, However, both devices are only suitable to a limited extent because the toxic carbon dioxide is heavier than air and collects at the bottom or at the lowest point.
In order to determine the degree of fermentation gas present, the extremely unsafe method of candles sample applied. Today, the carbon dioxide is extracted via exhaust doors (deaerators) and led into the open air or in large wineries in containers. The wine cellar was a popular meeting place for friends and like-minded people, where they discussed, philosophized and politicized over a good glass of wine, as well as "gossiping" about other (absent) people. It is said to have happened repeatedly that some explosive conversations were eavesdropped on the roof pipe or opening. See also under Customs in viticulture,
Left picture: Weinviertel Tourismus Horst Krönigsberger