i am going with 3/8 because it is what my poly block is rigged for and to put in 1/2" fittings(which only come in 1/4NPT or bigger),I would have to drill and re-tap my block and seeing as i have neither a drill press or a tap it seems it would be easier to go with 3/8.
and Michael.. including a well made fan shroud for less than 10.00 woul'd throw my decision in your favor.
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