"He who marches out of step hears another drum." ~ Ken Kesey
Screengear--- I am going to use the grease filter that is in it and put a piece of cut t-shirt material over it to change every so often, we do that on all of our fan intakes on equipment, keeps the dust out and allows the air to flow with no prob.
Just wanted to share this inline fan off amazon. $84.99 shipped for 720 CFMhttp://www.amazon.com/Output-In-line-Exhaust-Scrubber-Filter/dp/B004OH0DIE/ref=pd_vtp_lg_7