Industrial cooling fans with fewer blades are prone to generate large wind pressure, but they also have large operating noise. A cooling fan with a large number of blades is just the opposite.
The blade shape of cooling fan has sickle shape, trapezoid shape and AVC patent hem shape. Relatively speaking, sickle-shaped blades run smoothly and quietly, but the wind pressure they can generate is also small. Trapezoidal blades are prone to generate large wind pressure and noise. Folding is the best design, which can generate large wind pressure while keeping low noise, but it is only used in AVC's own cooling fan products at present. At present, sickle-shaped design is more common.