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One company in China makes all of those plastic fans, regardless of the name on them. The giveaway is that all of the motors have that "12V 80W" sticker on them and they use the same size motor on all the different size fans. There is a different shape to the fans, though. Over the past few years they have evolved the fan blades from straight, unconnected at the tips, ones to very curved ones that have an outer ring that bonds all the blades together. The latter is highly recommended, the unconnected blade types can have the blades snap off if they hit anything and the highly curved blades grab air more efficiently. There are literally 1000's of them for sale on Ebay. The small 7" fans don't seem to need the outer connecting ring on the fan blades, but the larger fans with curved blades do have the ring.
