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I would think if you know rpm you can estimate fan output based on size of opening, but I think that an approximation of that size would suffice since you ARE reducing it with the exhaust flow. Depends on how high the static pressure of the duct needs to be, but that is so far above my pay grade.......
Can't see any use for the 36 case except for old timey full restos which are gonna be really rare and involve cyphering the case serial number (I think they had one) dual port conversion are so common and cheap anymore.......
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