The pneumatic conveying of wood dust particles depends to a large degree on air stream properties. Relative humidity of air which carries off the dust particles has an influence on their basic aero dynamic property – entrainment velocity. The entrainment velocity varies with changes of relative humidity of air effecting on dust particles. These research works made possible the affirmation that between these parameters exists linear dependence. In an interval of relative humidity changes 35-95% the increment of the entrainment velocity is about 25%. This is the base for making the value of correcting the changes of entrainment velocity coefficient in dependence of relative humidity of air stream, in which the dust particles are conveyed.

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