Thread: Aluminum shroud heating issue
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08-29-2007 03:42 PM #6
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The problem here is that at speed, the fan cannot freewheel as fast as it needs to to allow full air flow. The electric motor acts as a sort of brake. Even if you turn the fan off, I don't think it can freewheel fast enough.
The shroud on my electric fan has two rubber flaps near the bottom. If the fan is pulling, they are sucked shut. If the air "stacks up" at speed, they open and relieve the pressure. They have to be one-way, though.
It's kind of hard to see, so I outlined it. There is one on each side.Last edited by Henry Rifle; 08-29-2007 at 03:45 PM.
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