The present invention proposes high diffusion aerofoils, capable of high diffusion over the blade surface, without any flow separation over the entire axial fan blade surfaces. These aerofoils are vital in creation of hirli diffusion blade members for the flow of air/ gas using axial fans. 1 ligh diffusion axial fans are capable of delivering air/ gas at higher delivery pressurc. This enables the axial fiiii with high diffusion acrofbils along its radial length to deliver high air/ gas flow in a high resistance scenario, running at lower speeds, low noise operations and consuming less power. The proposed aerofoils can produce delivery pressure of approximately 1200 Pa to 1300 Pa and the overall pressure ratio could he in range of 1.02 to 1.03. The compressors/fans with the proposed aerofoil design can produce efficiencies above 85 %.