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Term for a grille made of wood or metal, which is usually attached to one door half of the basement door. It allows during the fermentation despite closed wine cellar or press house the fermentation gases ( carbon dioxide ) to escape. However, if the fermentation room is lower than the cellar entrance, it can still be dangerous. Such devices were previously mainly in the basement alleys Weinviertel (Lower Austria) widespread. The fermentation gas was also removed via the so-called steam pipe, However, both devices are only suitable to a limited extent because the toxic carbon dioxide is heavier than air and accordingly collects at the bottom or at the lowest point. Today, the carbon dioxide is extracted via exhaust doors (deaerators) and led into the open air or in large wineries in containers. See also under candles sample and Customs in viticulture,

Proofing grid - cellar door with proofing grid

Image: Architecture Photography Vienna - Romana Fürnkranz

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