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Re: fan shroud
Think of it like this: you want to drink from a glass of water. If you use a straw (shroud) the water comes right up. But if you use no straw and just suck at the water from above the glass you get no water (airflow). the shroud is the straw the fan uses to get airflow through the radiator.
On some cars though you will be ok with no shroud IF the fan blades are at a distance of one inch or less from the radiator fins, though that way it won't pull air from the outer corners.
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