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This stuff confuses me no end.
As I understand it, larger ducts are more efficient, but require higher HP blowers to maintain air velocity high enough to carry chips, which is why most home shop collectors are designed for smaller duct work. For 6" pipe you may be looking at 3-5hp machines. You also need to upgrade the dust bags (both quality and surface area)to handle this increased pressure (or the dangerous small dust gets blown right through). Finally, most good systems now make use of a cyclone to reduce bag clogging. The cyclone has to be designed specifically for the HP of the collector. Even then, capturing the dust/chips at the source becomes a nightmare.
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