An axial fan is a type of fan that causes gas to flow through it in an axial direction, parallel to the shaft about which the blades rotate. The flow is axial at entry and exit. The fan is designed to produce a pressure difference, and hence force, to cause a flow through the fan.
A tube axial fan is a type of industrial fan comprising a disk type of wheel or a propeller, which is contained within a cylindrical tube-like structure. This fan is much similar to a vane axial fan, another popular axial flow fan variant, with the only difference that it has no straightening guide vanes