Downflow booths employ recirculatory airflow to provide the highest levels of operator protection from harmful airborne contaminants during powder handling operations such as charging and dispensing. The choice of a downflow booth depends on the desired level of operator protection, the size and type of containers that need to be handled inside the booth, and the need to integrate additional processing equipment with the booth. Downflow booths are frequently used in pharmaceutical, cosmetic, fine chemical, food, and nanotechnology applications.