HF Dust Collector Duct Size?

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Forum topic by Adamal posted 11-16-2013 03:51 PM 924 views 0 times favorited 4 replies Add to Favorites Watch
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58 posts in 1419 days

11-16-2013 03:51 PM

I know this topic has been discussed to death, but after much searching and reading (including Bill Pentz’s site), I’m still not sure how to proceed.

My shop is about 18’ x 20’ with a Unisaw, router table, 6” jointer and miter saw as the main tools. I plan on running PVC for the main duct.

The consensus seems to be to use 6” PVC as close to the machines as possible. The HF collector has a 4” inlet though… must this be enlarged? I’ve read (somewhere) that the main should match the inlet size of the collector.

If 6” is the best way to go, what do I use to neck down to 4” at the collector?

Have any of you used a 4” main? What are you’re thoughts as this is what I had originally planned?


4 replies so far

View b2rtch's profile


4821 posts in 2466 days

#1 posted 11-16-2013 03:56 PM

PVC is very expensive.
I used cheap duct from Lowes and HD, it works just fine with a Clear View

-- Bert

View Fred Hargis's profile

Fred Hargis

3840 posts in 1911 days

#2 posted 11-16-2013 04:41 PM

You need a certain velocity to keep the debris suspended as it moves through the duct. If you don’t, it falls out of the air stream and causes a clog. So, I wouldn’t recommend running 6” and choking it down to 4” at the blower. The blower impeller can probably be easily removed and replaced with a 6” shop built connection. Here’s what I don’t know: to use 6” ducting you have to have enough CFM to support it, and I have no idea if that unit will. Those that use 6” usually have a 2HP/12”impeller (+) blower. So get some info from those who have that particular DC before looking for 6” (and 6” is highly recommended since it allows a lot more air flow.) That said, you asked about 4” ducting, and that’s what I had for my first setup. I was impressed with the air flow I had, and it did what I wanted at the time. Just keep in mind that 4” will only allow ~400CFM or so flow, no matter what’s sucking air through it. But that may be enough to meet your expectations.

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

View thelt's profile


657 posts in 2798 days

#3 posted 11-16-2013 06:23 PM

I have 4” ducting going into a ‘Y’ on the DC the ‘Y’ has two 4” inlets that go to a 6” input on the DC. I get good air flow over a 15’ main line that drops to my surface planer, band saw, router table and oscillating sander. It works great for me.

-- When asked what I did to make life worthwhile in my lifetime....I can respond with a great deal of pride and satisfaction, "I served a career in the United States Navy."

View Adamal's profile


58 posts in 1419 days

#4 posted 11-16-2013 07:17 PM

FWIW, I just bought the HF collector today. I now see that the main inlet is 5”. Then there’s a wye with two 4” ports.

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