J. Phil Thien's Projects

I finally worked it out: a 2.25" reduction in diameter over 240 degrees is about 1.15 sq/ft of area, which is about 5.9 times the area of a 6 inch opening.  I would think that it would not have to be changed for a 6" duct.

That means that its just leaks that is causing me pressure drop, and I have to fix that tomorrow.


By the way did you know you can shape PVC with a propane torch?

The main page says that he reduced the Diameter by 2.25 meaning that the slot is 1.125 wide.  I was wondering today if that is wide enough for a 6" duct to operate effectively.  My Calculus is rusty so figuring out the square inches of that slot is not as easy as it looks.

Quote from: rsquest on January 18, 2009, 10:18:44 PM
Seems to be working great so far.

Thanks for sharing the pics.  Using those I was able to complete my trash can last night.

Now I just need to cut the recess on the baffle portion and get the 6" PVC pipe put in to the top.

I did some searching around and re-reading of Bill Pentz's design and I was wondering.  If you took a 14-15" impeller and the blower box of his design and ran that straight down into a 6" version of the Thien baffle like someone just posted. 

Couple that with maybe a 3HP motor (perhaps a little small) and output to a wynnenv Cartridge Filter we're moving some serious air.

I might have a cheaper source for a decent size Impeller for cheaper than the Jet.  Grizzly's 14 1/2" impeller for their G0671 model can be shipped for $79, add 89 for the filter and a surplus motor and you have a serious dust collector for about the price of the HF 2HP when its not on sale.