I have a question regarding blade position in shroud, of an air condenser, using 14 fans. On a % basis, should most the blade,be in the shroud ,say, 70%,or only say 30% for max air movement? Some one told me most of the blade should be below for more air movement,but with many fans working to pull the air through I thought maybe Pressure differential, might be more into play then, volume. Does anyone have any thoughts on this?