I just bought one of those hanging air filtration units for my shop. My attempt at an exhaust fan failed due to poor CFM from my cheapie fan. I lit some paper and let it smoke and 5 feet from the fan I saw no movement at all. The dust filtration unit wasn’t much different in cost to a better exhaust fan, so I bought one. Should I hang the unit over the bench and just filter the air, or should I take the filter out and aim the unit out the vent above the door and just blow the dust out of the shop? The door exits to the street, and this is a shop in my house where already I take measures to collect dust at the source, so this is just added protection. I’m not going to be blowing tons of dust out of the shop.
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