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Published on Oct 13, 2010
Watch the duct tape on the door fly out when the fan turns on! 18,000 cfm, 5hp, 30" ID, 45 mph through a giant muffler exhaust. The ducting is 30" ID perforated sheet metal with 2" of insulation, then the 34" OD outer shield. It will clear the entire shop volume over 3x per minute.