We provide aerofoil designed axial flow fan in various designs such as fixed bladed and variable pitch angle bladed. The impellers of the fan are of cast alloy aluminum type and have 4, 6, 7, 8 and 11 blades as per the specific design. These can also be provided in two stage construction to be used as reversible tunnel ventilation fans. The casting of axial fans can be designed to allow the fans t