Quote Originally Posted by JackdaWack
The fan is going to be the most expensive and i wouldnt bother with trying to get something cheap that just barely works, i got a squirlecage fan 465cfm and it looses probably half of that going through the filter, get an inline fan no matter what! They seem to be the most efficient fans with filters and ducting.
Inline fans can be efficient, but I ordered a 4" Vortex and found it was too loud. I bought a speed controller to reduce the speed and it created a loud hum. I contacted Vortex and they were no help so my new Vortex sits in a box unused. If someone knows of a speed controller that won't cause the loud hum, an inline fan would be a good solution.