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426 Posts
Discussion Starter · #1 ·
Looking at this site: Spal fans

It appears that the 5.6" fans flow 91% the CFM as the 6.5" fans, but yet use 40% the amperage to do it.

So.. why are the 6.5" fans so popular?  There is plenty of room for the longer 5.6" fans too.  What gives?

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