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My Becool 1000hp rated radiator/dual fan module has no shroud (this was a surprise to me when I purchased it) whereas the lower rated Becool modules do have a shroud. So obviously the effect of a fan shroud is more complicated than what most of us seem to believe, which is that a shrouded fan cools better than an unshrouded one.
Shrouds are quite complicated. You need a decent understanding of fluid dynamics to really figure out what's going on in there.
There are some basic things to know. It has to guide the air through the fan not force ait between the blades. They aren't magic. You can screw it up rather easily despite having good ideas.
One of the most important things about an electric fan is the current draw. If it won't pull 30 amps then it won't pull enough air to do heavy work.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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