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Old Feb 10, 2010, 05:10 PM
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Valencia, CA
Joined Jan 2008
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Quote:
Originally Posted by Richardmid1 View Post
Im using the HET 3 blade fan which has a smaller hub than the 4 blade.
Which ever is larger, the Hub, or the Motor Housing O.D., is what what you want to use along with the I.D. of the shroud Housing, to determine the FSA.

Shroud I.D. area...............xx
minus.......................... -
Motor Hsg O.D. area..........xx
.................................._____
100% fan swept area........ xx
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