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The Waddle fan was an open type of centrifugal fan with the casing an integral part of the fan. The casing narrowed towards the periphery and the vanes were curved back from the direction of rotation. They did not require a housing around them and discharged the air all around their periphery.
The air was led into the fan by a curved throat and the back plate also curved in towards the inlet. On smaller diameter fans this allowed the bearing to be located almost centrally within the fan, removing the need for a bearing in the fan drift and enabling vibration free running.
Waddle fans were very effective, although the early, large diameter ones, were susceptible to wind turbulence. As their design was improved over the years, however, their output increased and their size reduced.
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