When dust particles are very small, we say it is dust, and the process of separating particulate matter from air is called dedusting. Dedusting is performed as filter or dry, and for even finer particles it is performed as wet or for finer particles as aqueous. Depending on the technological process, their application is very large. Everywhere dust is generated by technological process they are used in powder packaging, welding, casting, combustion. In the reversible system, they found application to create clean rooms. In batch production we work with interchangeable filters. The number of filter cartridges determines the capacity.