Pneumatic Cyclone
From Cornburning
Information about Vacuum systems.
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Build Your Own Dust Collector
http://www.copycarver.com/Dust_collector.htm Drier motor/fans may not produce the CFM you're interested in. Drive by any heating and cooling company and you will see a pile of used (but still operational) air handlers and furnaces. They have to pay to dump them, many will give them away for free.
