The work features fluid bed process and its possible applications in different engineering processes. The author's main interest is heat and mass transfer. The work provides principles of calculation as well as the sources of essential data. It presents the most important types of drying units with their advantages and drawbacks and offers guidance in selecting the right draying units for different processes. Moreover, it promotes innovative air-cleaning solutions with the use of fluid bed process and a special type of grid invented by Polish engineer J. Majkowski with the author's co-operation.