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I'm in the process of finishing my custom fan shroud and I wanted to know how much clearance should I allow between the outer tip of the fan and the inside (I.D.) of the shroud?

FYI - My fan is 16" and my aluminum radiator is 20" wide (not including the radiator tanks on each side).

Thanks in advance!
 

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I don't think there's any "rule of thumb" here but you certainly don't want a huge clearance or the shroud will be ineffective. My guess, and it's pretty much what I have, is about 3/4 inch.

Also, you want the fan itself to be pretty close to the radiator, like within about an inch or so.
 
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