What Is Air Velocity?
Air velocity is the speed of air moving through the ductwork. It affects the amount of dust that can be conveyed through the system. The size of the ductwork, the type of collected dust, and the airflow rate determine the ideal velocity. This velocity within the system is measured in feet per minute, or ft/m.
AIR VELOCITY CALCULATOR
Importance of Air Velocity In Baghouse Design
Proper air velocity ensures that dust stays suspended and doesn’t settle in the ducts.
In order to transport the dust through the system, the conveying air must reach a value called the minimum air conveying velocity. If the air velocity is below this value, the dust will ultimately settle at the bottom of the duct.
The capture velocity is the conveying air velocity at the point of introduction of the solids in the duct, usually a hood or a direct duct connection to a piece of equipment. In order to be able to transport the dust, the velocity must be greater than the minimum conveying velocity of the dust. Air velocity within the system is measured in feet per minute, or ft/min.
Note: This calculation is a good starting point, but duct material, layout, and type of dust must be considered. Consult with a dust collection expert to get a safe and efficient design.