(57) A devise for separating fibres and gas, comprising a cyclone (I) with inlet (2) for a mixture of fibre/gas and separate outlets (3 and 5, respectively) for fibres and gas, respectively. In front of the gas outlet (5) a screen (6, 10) is located, which is provided with apertures and attached on a rotatable shaft, so that the rotation of the screen gives rise to accelerations and forces preventing fibres from passing through the apertures in the screen (6, 10).
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