Quote Originally Posted by Drew Wiley View Post
Bingo. Thanks. Nothing remotely related to true 250 extraction, but evidently useful for simpler applications. I had something similar exchanging air in a makeshift film drying cabinet, with nothing other than basic "permanent" coffee filters glued over the intake and outlet ports to prevent dust.

Not sure what your "Bingo" point is. I was just mentioning a cheaper source of efficient fans for do-it-yourselfers.