Building Mech fan shroud need info ASAP

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rustytoolss

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I'm building a fan shroud for my 18 1/2 mechanical clutch fan. How large of hole would you think I should make for safe clearance and good air pull ? Need this info ASAP thanks guys
 
I would go 3/4 to 1" all around clearance. And half of the fan blade in the shroud.
That strap is a real good idea with the rubber mounts.
 
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