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In the world of dust collecting the two-stage cyclone is king. This machine deposits dust and wood chips into a convenient canister rather than a plastic bag, which can be hard to empty. The motor and impeller sit on top of an ice cream cone-shaped canister, which creates the cyclone effect forcing down debris, avoiding damage and wear on parts. An internal filter or external bag works nicely to clean dust out of the air, not to mention save a lot of space on the floor.
Single stage dust collectors only collect dust through an impeller fan and deposited into a bag. The exiting from the machine passes through a cloth type filter mounted on top of the collector. These are, of course, the most popular and cost saving and are most commonly found in the home shop.