For axial cooling fans, the major source of inefficiency is located at the blade tip. This interaction between high and low pressure air causes small vortices to form, creating unwelcome noise and inefficiency on the fan. By connecting the blade tips with an outer ring (like the spokes on a bike wheel) and hiding them within a inlet cone, these vortices are not given a chance to form, thus providing a giant boost in efficiency. This design feature also provides crucial mechanical support to the blades, making the fan assembly stiffer and less vulnerable to mechnical damage from fatigue and wind loads.
The Whizz-Wheels most striking aspect? Its unique blade design. Other fans ignore the fact that the blade tip is moving much faster than the blade hub, and use a plain, uniform blade profile. The Whizz Wheel ensures optimum airflow by curving the blade profile along its entire length, much like a gas or wind turbine, meaning that the blade is always at the optimum angle. But that's not all, by increasing the number of blades to 16 (instead of the usual 4-5) the fan can run at a much lower RPM, further ensuring that your noise emissions and motor power are kept to an absolute minimum.
How to further improve efficiency? Look further than the fan. The Whizz-Wheel is designed with a specially shaped inlet which forces the air stick to stick to it, guiding clean, laminar air towards the blades for the most efficient performance. Even at strong crosswinds this inlet design ensures that the fan is never starved air, unlike with a conventional 'bell' shape. Check out our short movie to see this feature at work.