A centrifugal fan draws air into the centre, or eye, of a rotating impeller and flings it outward by centrifugal force. As the air leaves the blade tips at high velocity it enters the scroll-shaped casing, which slows it down and converts that velocity into static pressure before discharging it through the outlet. This 90° change of direction is what lets a centrifugal fan build far more pressure than a straight-through axial fan.
The shape of the impeller blades sets the fan character: backward-curved blades are efficient and stable, radial blades are rugged and good for dust, and forward-curved blades move high volume at lower speed. Our four series use the blade type best suited to their duty — and every impeller is dynamically balanced to G6.3 so it runs smoothly at 2,900 r/min.