Dust collection

Not enough to notice. I’m sure that joint causes some turbulence and drag, but it would take laboratory quality instruments to measure it. Over time there will be a small build up of fine dust in there, but that’s also nothing to worry about.

-- Our village hasn't lost it's idiot, he was elected to congress.

That is how pvc goes together. The female side has a slight taper so the male side will not bottom out and make a smooth joint. As Fred said, it probably won’t cause any problems.

If possible, you can use a sweep in lieu of 45s, that will help with smoother flow/less resistance.

Just a thought….....

-- Don't let perfection get in the way of plenty good enough

Or go with steel duct with long radius 90’s. And the plus is no shocks off of steel. And about the same price as pvc.

4” won’t cut it for most things. Sorry. Have you read all of Bill Pentz papers on the subject? I use 4 inch only for the drop to my spindle and disk sander. I will probably drop a 4 inch to a blade guard on my TS, but even the drop to my TS and BS will be 6 inch. BS splits the 6 to two 4’s right at the ports. 6 inch right into the TS base. 4 inch port to connect my jointer and planer, as they are only chip collection, no dust to speak of. Same port will feed a 4 to twin 2 1/2 for the top and bottom of the router though I suspect it will be inadequate.

Log sweep metal are really expensive. I am using two adjustable 45’s to make a longer radius.

PVC will not meet code in a lot of places. You can run a bare wire through it, or some run a screw in every couple of feet all wired to ground. 6 inch spiral duct is really expensive, but so are my lungs.

You can get a little aerometer to measure velocity pretty cheap. I was quite surprised. Not only did it prove to me 6 inch is required, but I will probably upgrade to a 3 HP system. Then the trunk from DC to the miter hood and split to the overhead 6 inch will move up to 8 inch.

4” won t cut it for most things. Sorry. Have you read all of Bill Pentz papers on the subject? I use 4 inch only for the drop to my spindle and disk sander. I will probably drop a 4 inch to a blade guard on my TS, but even the drop to my TS and BS will be 6 inch. BS splits the 6 to two 4 s right at the ports. 6 inch right into the TS base. 4 inch port to connect my jointer and planer, as they are only chip collection, no dust to speak of. Same port will feed a 4 to twin 2 1/2 for the top and bottom of the router though I suspect it will be inadequate.

Log sweep metal are really expensive. I am using two adjustable 45 s to make a longer radius.

PVC will not meet code in a lot of places. You can run a bare wire through it, or some run a screw in every couple of feet all wired to ground. 6 inch spiral duct is really expensive, but so are my lungs.

You can get a little aerometer to measure velocity pretty cheap. I was quite surprised. Not only did it prove to me 6 inch is required, but I will probably upgrade to a 3 HP system. Then the trunk from DC to the miter hood and split to the overhead 6 inch will move up to 8 inch.

- tvrgeek

-- Everything is a prototype thats why its one of a kind!!

ive got a double 45 situation in several places in my shop.it’s no issue.im using 4” throughout my shop from a 2hp jet dc with no problem.

-- working with my hands is a joy,it gives me a sense of fulfillment,somthing so many seek and so few find.-SAM MALOOF.