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Aerofoil fan blades are designed with a streamlined cross-section, similar to an aircraft wing. When the fan rotates, air flows smoothly over the curved upper and lower surfaces of the blade. The aerofoil shape creates a gradual pressure difference, resulting in efficient movement of air with more breeze. Because the airflow remains attached to the blade surface for most of its length, flow separation and turbulence are minimised, particularly near the trailing edge. Since turbulence, vortices and unsteady pressure fluctuations are the major sources of aerodynamic noise, reducing them results in quieter fan operation. In addition, an aerofoil blade can generate the required airflow more efficiently and may achieve the desired air delivery at a lower operating power or tip speed — which further reduces aerodynamic and mechanical noise.