I’m pondering the best route for small shop, one machine at a time, mobile dust collection. To that end, I’ve read many of the reviews and discussions here, as well as Thien’s information, and B. Pentz’s informative site.
I had planned on a cheap-ish mobile 2hp unit, adding a wynn filter, and making a larger version of a Thien seperator. I was planning to take 6” duct just 6 to 8 feet to a gradual transition to 4” at my machines. (I don’t really know whether, with a run that short, it makes any difference whether I run 6” duct to a 4” port, or just run 4” duct.)
Anyway, I continue to fret a bit about those 4” ports on everything made for the home shop. I know they’ll get the big stuff, but Pentz data certainly suggests we can’t get enough air through the 4” hole to get all (most?) of the dangerous small dust. At first, I thought he might just mean 4” pipe networks, but no, he’s pretty specifically indicating that large holes must be created in our beautiful machines. I don’t know that I can get myself to puncture a Sawstop. (I can’t.)
All that is a preamble to note that the Jet Vortex collectors, at first blush, seemed like a good idea. Great! I don’t have to spend the time building the baffle. Sure, the chips would still hit the impeller, but the filter clogging nightmare would be reduced. The Jet Vortex line, has 6” intakes (or two 4’s from a wye.)
Then, I noticed that the flex tube between the motor/impeller to the cannister/bag looked a bit smaller than it should. Maybe it was just an illusion from the images. Nope – I checked the manual, the tube is 5”.
If I run 6” duct work off this machine, and its pushing the air through 5” flex hose—isn’t there a problem there?
Wouldn’t this be similar to hooking up 5 or 6 inch ductwork to a 4” intake? Now, I know the listed 1100 cfm for this machine is not practically useful in that it is measured right at the intake with no “load” and no gunk in the filter. However, I’m thinking maybe that 5” flex tube connection is a bigger problem in that it puts me in the position of trying suck through 6 by pushing through 5. Is that worse? Maybe I’ll be so close that it just won’t matter… not sure. Alright, engineers, fire away—
-- I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them ** Thomas Jefferson