Reply by Manitario

as already commented; an air filtration unit won’t save your lungs or appreciably improve air quality in your shop without a DC unit. They are not designed to handle the dust loads produced by machines that are not connected to a DC. FWW recently had an article detailing this. As well, for a 4000 sqft shop with 8ft ceilings you’ll need at minimum 3000 CFM of air filtration in order to do the recommended 6 air exchanges/hour in your shop. JDS does have a high end air filtration unit that moves 2100 CFM but it is $1300 and still wouldn’t move enough air for your shop size. Therefore you are looking at needing several filtration units, which as I said, still won’t be enough to protect your lungs without a DC unit.

-- Rob, Sault Ste. Marie, Ontario