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Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Filter Bags Versus Canister Filters 
Question
What is the difference in canister filters and dust bags? It seems like a lot of dust goes thru the bags. Many of the dust collector manufacturers don’t mention what size micron dust particles they catch. What size dust particles should I be trying to catch? Which is better - bag or canister? Do I need a cyclone? Forum Responses
From contributor B: I own a Belfab JJ, the 2 hp model. Filtration on all the Belfab bag-equipped dust collectors, is 0.5 micron. The filters are rated industrial needle-felt filters. Needle-felts can have up to 60 cfm/sq.ft. breatheability. On a dust collector like the JJ, the filters are being used at roughly half capacity, which helps to enhance fine particle filtration. The slower the air flows through the fabric, the better the filtration, and with less pressure drop. Kraemer, would have similar bags, but also offer Beane*Bag filtration bags, which is a tubular loop-pile knit, capable of up to 65 cfm/sq.ft. Most of the portable Delta dust collectors came with 30 micron filters as standard issue, so it is no wonder you see dust coming through the bags. Typically, the finer the filtration, the freer-breathing the bag will be. A cyclone is a pre-separator (pre-filtration). This will tend to keep your filters cleaner for a longer period of time before having to clean them. There are several types of cyclones - pull-through and push-through. A push-through design has the blower before the cyclone. Cyclones typically are used to filter out the larger waste, with only some of the fine dust getting to the filter. Since you're operating up to two large capacity machines simultaneously, I'd suggest you consider at least a 5hp Industrial dust collector. Some considerations might be the Kraemer E-51; E-52; and E-53. As for the Belfabs, you might want to take a look at the Belfab LW series. This is a modular design, which can be easily upgraded as you grow your shop. The LW's, start at 3hp/ 1400 cfm, and can be expanded to 20hp, and 6000 cfm. Belfab also offers the Hummer series dust collectors, which essentially are quieter than typical capacity dust collectors. They use 1800 rpm fans in those, and a very large range of performance levels.
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