In the article movement trajectory of the particles in dust-arrester intended for cleaning of perfected air in technological process of cotton cleaning industry was given. It is known that the composition of perfected air in cotton-cleaning industry is directly connected with efficiency of its cleaning. The percent mineral and organic material in the composition of cotton passion depends on the technological processes. Revision productivity using any vacuum cleaner instrument depends on the specifics of passion, not review their types. It is possible to say that, it depends on morphological characteristic of passion, on the form, chemical composition, density, comparative surface, adhesion, spilt and poring and moisture it. In existing technological process of primary cotton processing the perfected air with various components of dust particles is allocated. The air speed admitted info the camera of dust-arrester signifies in the cleaning process of dusty air. In details, the correlation between the speed of particle eddy and movement trajectory of these particles in the aggregate is not completely researched. In this regard, air purification from fibrous impurities is relevant.