Thread: push or pull

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Marco: Probably even 1/4 inch is ok clearance, but you need enough clearance so your fan blades don't kiss the radiator fins. All the shroud is going to be is a flat aluminum or sheetmetal plate, made to the same size as the radiator core, sealed on all the outside edges, with a hole cutout in the middle as big as your fan.

Not sure how you would seal the outside edges. Maybe some sort of weatherstripping around the perimeter, with little bolts and nuts holding the shroud to the radiator frame. The idea is, you want as little leakage of air as possible so you can get as much air as possible being sucked through the core.

Then the fan simply bolts to the plate, centered on the cutout. You should be able to fab up one of these with a jigsaw in an evening.

The 1/4 inch I mentioned is only because of your space limitations. If you have more, you can make it deeper, but then your shroud would have to be more than just a flat plate, it would need to have sides to come up to that depth and touch the radiator for a good seal. Just make sure the spinning fan has enough clearance to operate without hitting anything.

I'm posting the picture of ours again. Maybe it will give you some ideas.

Don