Affordable 5 inch DC ducting?

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Forum topic by Dustin posted 10-31-2017 01:24 PM 1121 views 1 time favorited 8 replies Add to Favorites Watch
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705 posts in 1342 days

10-31-2017 01:24 PM

Topic tags/keywords: question

Title pretty much says it all. I’m awaiting delivery of a steel SDD, which come with a 6” outlet and 5” inlet. I’m trying to avoid choking this down to 4 inch pipe immediately, and am looking for solutions to run 5” ducting (converting down to 4” right by the tools). All my tools are currently harbored by the center of my shop (planer, jointer, table saw), but I’ll likely run two more branches to spots where I’ll eventually have a miter saw station and lathe station.

I’ve checked Oneida’s website: the 26 gauge ducting isn’t too bad of a price, but the fittings are brutally expensive. Are there more affordable options for 5” solutions? I tried to find 5” DWV PVC, but with no luck. By my current thinking, I’ll only need 3-4 elbows and 2-3 wyes: should I just bite the bullet and fork out the cash?

All suggestions appreciated!

-- "Ladies, if your husband says he'll get to it, he'll get to it. No need to remind him about it every 6 months."

8 replies so far

View Robert's profile


3598 posts in 2083 days

#1 posted 10-31-2017 02:09 PM

If your blower is >1000CFM I would use 6” ducts. Readily available in PVC.

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

View Dustin's profile


705 posts in 1342 days

#2 posted 10-31-2017 02:49 PM

If your blower is >1000CFM I would use 6” ducts. Readily available in PVC.

- rwe2156

The blower is less than that (though I may upgrade in the future). I didn’t want to go to 6” ducting mainly because I’ve been warned (through Oneida and elsewhere) not to reduce the pipe on the return to the separator (though reducing from the separator to the tool is acceptable).

-- "Ladies, if your husband says he'll get to it, he'll get to it. No need to remind him about it every 6 months."

View Hermit's profile


239 posts in 1927 days

#3 posted 10-31-2017 03:06 PM

If you have a nearby a/c wholesaler they’ll have it or can 0rder it for you.

-- I'm like the farmer's duck. If it don't rain, I'll walk.

View YesHaveSome's profile


165 posts in 860 days

#4 posted 10-31-2017 03:11 PM

I was looking into this a while back and found that 5” snap loc is pretty affordable and readily available at the BORG.

-- But where does the meat go?

View Fred Hargis's profile

Fred Hargis

5919 posts in 3095 days

#5 posted 10-31-2017 03:25 PM

There’s a reason you didn’t find 5” DWV, it isn’t made. Since you threw in “affordable” I’d say the snap lock is going to be your best approach. Be sure to seal the seams with foil tape, and get the heavier stuff (26 gauge).

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

View bigblockyeti's profile


6179 posts in 2322 days

#6 posted 10-31-2017 04:26 PM

This is one of the cheaper places I’ve found:

It does get a little more expensive after adding in s&h as well as crating but if you’re able to go there, it’s a tough deal to beat.

-- "Lack of effort will result in failure with amazing predictability" - Me

View retfr8flyr's profile


386 posts in 2271 days

#7 posted 10-31-2017 08:04 PM

Home Depot has 5 inch metal duct work, they just don’t carry it in the stores but will ship it to the store for free. That will probably be your cheapest option. 5 inch seems to be the bastard size and not that much is available, everything is 4, 6, or larger.

-- Earl

View d38's profile


138 posts in 864 days

#8 posted 11-05-2017 04:22 PM

If 5” is what works best for you, check your local HVAC dealer.
Or if a Grainger store is nearby, they sell Greenseam brand snaplock and fittings.
Its 24-26 gauge depending on diameter, and its got a propriety foam seal pre-installed on seams and the female end (may be great for HVAC, might not be a good enough seal for DC suction).

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