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They do help. How much? Depends.
....
So, it depends.
Well, we are giving him opinions and options here. And you have given sound advice about the relative performance gain with a shroud. But if he decides he wants to run shrouds I was giving him a cheaper option than those overpriced shrouds from Feser. And maybe he has some old 120 mm fans sitting in the closet that he can make shrouds out of for free too. The other day I took an old 120 X 38 mm Sunon fan I've had forever and don't use because it's so freaking loud and made a shroud out of it.