Reply by crank49

As an engineer who has designed and built and installed hundreds of thousands of CFM of dust collectors, bag houses, cyclones, wet scrubbers, packed tower gas scrubbers, and cartridge filters I can tell you that probably 25% of what Pentz says is almost true.

It is completely absurd to make a blanket statement that you need a certain size of duct or a specific number of CFM to collect the dust from a given type machine. There are many many more factors that come into play. Particle velocity and direction of release, position of the source, cross drafts, temperature, type of blade or tool, speed of blade, how closely is the blade enclosed, duct velocity, etc, etc.

-- Michael :-{| Diapers and politicians both need to be changed often; and for the same reason.