Axial flow fan is a development of the propeller fan, but is more efficient by 70%-80% due mainly to the aerofoil section blade s and finer clearances between the impeller blade tips and the cylindrical fan casing.
Ref: 122155/2006-09-25

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Development (Development means the carrying out of building, ...)
Development (Development refers to the systematic and ...)
Casing (Casing relates to a packaging material for ...)
Axial (Axial is described as the position as it relates ...)

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