This sound was captured inside the etanol fabric of agroetanol. This is a machine that dry the backsheet of the grain, in order to produce animal food from some of the parts of the grain that excludes in the process of making etanol.
Lantmännen Agroetanol, which is located in händelö Norrköping, has been running since 2001. Since 2008 they have been working on a new way of production, that will allow them to produce 230 000m3 etanol and 200 000 tonnes of protein rich animal food.
Standing next to it makes you feel like you are looking on the worlds biggest dryer.