Mate............. you need the shroud to seal all around the core to get a thermo fan set up to work properly in tough conditions.
You want the effort of the fan being used to suck air only through the core, not around the sides.
You want to surround ALL the core, otherwise it will never work as well as the stock system that surrounds all the core in all conditions.
That's the beauty of EL twin fans and shroud on an RRC rad...........like a factory fit, that's why they work so well.
cheers, DL
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