This is the fan I got HydroFarm: Active Air 4ā? In-Line Duct Fan 165 CFM [eco-5600A] - Fans, Blowers & Ducting - Environmental Control - Discount Specialty Farm, Greenhouse & Garden Supply Store - Horticulture Source
It is 165 CFM. I just ordered the speed control for it because it is too loud when its running full throttle.
If you look at the filter ratings at Can's website it has Recirculating CFM and Exhaust CFM. I just wanted to make sure, but doesn't the exhaust CFM rating apply if you are planning on just using a single pass through the filter. I have a grow tent, so I need the air to be odor free after it's first pass, even though the same air will likely get circulated back through the tent again. If that is right, then I think the 9000 would probably be enough at an exhaust CFM rating of 55 once I turn my fan down. I'm starting to think maybe I need to go bigger than that though. I think the next step up is the model 33 which has an exhaust CFM rating of 200, which would be way more than enough for my fan and what I'm doing.
Does that sound right? If it does my only question I have left is whether or not I should get the regular can filter or should I upgrade to the 38 Special.