Originally Posted by bob213
After reading your edit I'm not sure what I was looking at but you are correct... 48cfm per fan is great! CFM was my main concern, but with a total of 192 cfm a switch to control each fan makes sense. Lower ambiant temps would let you use fewer fans. I was never abdicating that MY fan was the ONLY answer and after seeing a 192cfm, 4 fan setup for that price, I would have to say it would be an excellent choice where the space allows it.
30 years as a design engineer pounded into my head - many
times - that _everything_ is a compromise / tradeoff. In this case,
the main variables are price, airflow, size, power and sound level.
There are likely many acceptable combinations depending
which of these are important and which are less so. Everyone
will likely want a different ordering of the factors.......
I always remember the poster that some engrs would put
above their desk:
Pick any two.
So very true............