Walker Barrier Systems Down Flow booths protect operators from the harmful dusts generated during manual powder handling operations such as dispensing, sampling and charging. Clean air from the ceiling plenum is distributed evenly across the entire work area pushing any breathable dust generated downward and away from the operators breathing zone. The high velocity exhaust grills direct the dust into the on-board filtration system which then recirculates the clean air back into the ceiling plenum. A small amount of air is exhausted after the filters to ensure containment in the booth. Down flow booths are available in a wide range of sizes and are available in various materials of construction.