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May6-07, 03:06 PM
P: 3
I think that your too rigid in your thinking. With a 6" x 4" paddle wheel design fan blade 50% of which is inside the tunnel, the resistance would be negligable vs. the potential power production. We all understand the prior concept noted but this is an existing exhaust fan with a harnessable resource, at least I think it is, up to a point where the resistance is too great and impedes the functionality of the exhaust fan.