Centrifugal "Inflatable Air Blower" - after the gas flow axially into the fan impeller, the centrifugal force is compressed, mainly along the radial flow. Axial Fans - Axial flow into the rotating blade channel, due to the interaction between the blade and the gas after the "Inflatable Air Blower" approximate flow of gas is compressed on the cylindrical surface of the park along the axial direction. Francis fan - gas and spindle into the direction at an angle of rotation of the leaf into the road, approximately along the cone flow. Crossflow "Inflatable Air Blower" - gas across the road rotating blades, blade action subject to elevated pressure.