I know this has probably been asked but I got a 4 inch inline fan - scrubber - I think the fan may be too powerful. I am sure there is a way to control the speed but from what I have read a light dimmer is NOT the way to go. suggestions. i wish i would not bought the fan/filter my space is cramped.
A router speed controlers work great for in-line fans. http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=43060