Table Saw Dust Collection: underneath and overhead questions

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Forum topic by Holbs posted 11-16-2014 05:51 AM 1481 views 0 times favorited 4 replies Add to Favorites Watch
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2032 posts in 2266 days

11-16-2014 05:51 AM

Here is my current project that is about 50% completed. I am in the midst of a fliptop miter saw / table saw combo station. You can see the 6” HVAC ductwork I’ll be using for underneath the saw. While looking up to see how other’s have done the interior of their saws for air flow and such, it came to me I really should look into overhead dust collection as well. It’s not too late to toss in a 6” to 6” to 4” wye, and have the 4” be ready for future overhead use. But… the question I have is: since I already will have 6” going down below the saw, is using 4” overhead too big? Should I go 3” ? Something tells me.. I should of went 5” below and 4” up top.
The Bill Pentz diagrams show 5” below and 3.5” overhead. Hmmm….

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"

4 replies so far

View Fred Hargis's profile

Fred Hargis

5236 posts in 2730 days

#1 posted 11-16-2014 12:53 PM

It may depend on what the DC is. In my case, I have a 6” trunk going to the saw cabinet. The line also has a gated 4” connector to an overblade pickup (it’s choked down to 3” at the blade). This works very well for me, but I have a DC with a 14 1/4” impeller pulling the air. I suspect with a 12” impeller it might not do as well, but I bet it would still be adequate.

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

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2032 posts in 2266 days

#2 posted 11-16-2014 03:32 PM

i guess HP and model helps to decide. i have a 3HP dual bag grizzly. unsure of the impeller. but i do think, 6” trunk right into the bottom of the saw with 4” branch is too much. probably will knock it down to a 6” x 5” x 3” wye. 6” feed, 5” to saw, 3” for future overhead. just means i gotta wait til i get more parts :(

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"

View buildingmonkey's profile


242 posts in 1785 days

#3 posted 11-17-2014 02:40 AM

I have 4” overhead on the unisaw, and have a new Hammer tablesaw, and it has only 2” overhead, but both work fine. They both suck up the thin strips that you sometimes take off while ripping. Neither leaves the table completely clean.

-- Jim from Kansas

View timbertailor's profile


1594 posts in 1661 days

#4 posted 11-17-2014 02:20 PM

The idea behind larger ports at the cutting location is to try to collect the finer particles that are the most dangerous.

If you have the HP (3+) and the ducting (6”), then I would use it above the table where most of the fine dust tends to escape. What falls below the blade is easy to collect and as long as it gets collected, any size should do IMO.

-- Brad, Texas,

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