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I wouldn't add any more fins to it, since you'd have to get them perfectly straight for them not to create more area for the force of wind to act upon.
I believe that those diffusers are made in molds created by 5 axis mills and vacuum forming machines.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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