The higher the better efficiency centrifugal fan. Under conditions of high efficiency as calculated to meet the required flow, pressure and other requirements at full ventilators runner conducted geometry, called aerodynamic calculation, dynamic calculation is generally known for its barrel.
     Aerodynamic calculation, may decide centrifugal fan flow channel geometry, which was converted to a percentage of the impeller diameter, it can be drawn from its relative size. On the other hand the size of the plotted centrifugal fan geometry (including the thickness of the parts), called centrifugal fan aerodynamics thumbnail. Aerodynamic sketch is the same type of fan shared geometry.