Filtering dust separation proceeds in various conditions. It is necessary to determine the work factors of dust filter for each case of this method of air cleaning – first of all to select a suitable fibrous material on which the separation process of solid particles from air stream occurs. Increased relative humidity of air conveying the dust particles is always a significant difficulty for the separation process in wood dust separators. Application of unwoven fabrics with special finished active surface – hydrophobically appreted – significantly rises air cleaning of wood dust in these cases. At standard unwoven fabrics – with homogenous structure – appears an opposite interaction. The separation efficiency decreases with growth of relative humidity of the air stream.

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