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5" DC ducting from Home Depot

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Forum topic by De1taE1even posted 07-17-2019 04:57 PM 421 views 0 times favorited 13 replies Add to Favorites Watch
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De1taE1even

44 posts in 452 days


07-17-2019 04:57 PM

Hey everyone, I’m hoping the experts can help me out because I’m confused.

I have read on numerous websites and forums that 5” ducting is hard to find because HVAC ducting comes in 4” and 6”, so the big box stores don’t normally carry 5”. Therefore 5” ducting is expensive because you have to purchase it from Rockler or Oneida. But, my local Home Depot has plenty of 5” ducting, so I think I’m either missing a key piece of information, or I’m just mis-remembering. Here’s the ducting from HD:

https://www.homedepot.com/p/5-in-x-5-ft-Round-Metal-Duct-Pipe-CP5X60/100113221

Looks like it would work just fine, and is less than half the cost of Oneida or Rockler, and I can just drive down the street and pick it up. What am I missing?


13 replies so far

View EarlS's profile

EarlS

2987 posts in 2803 days


#1 posted 07-17-2019 05:07 PM

I don’t see any problems as long as you can get the necessary 5” fittings and adapters that go with the pipe. As long as your fan can deliver the appropriate flow, velocity, and pressure then you should be fine.

-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

View Fred Hargis's profile

Fred Hargis

5647 posts in 2948 days


#2 posted 07-17-2019 05:18 PM

I think you may have it a little sideways. With thinwall PVC 4” and 6” are the commonly available sizes…and actually the 6” isn’t all that commonly available. A lot of times when someone is wanting 5” and looking at PVC, the recommendation is to shop around for the 5” HVAC stuff. Regardless, you’re good to go with what you found, so have at it.

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

View De1taE1even's profile

De1taE1even

44 posts in 452 days


#3 posted 07-17-2019 05:42 PM

Ah, ok thanks Fred! That must be where my confusion was, PVC vs HVAC.

EarlS, pretty sure I have enough flow, I’m using the HF “2HP” DC with a Grizzly filter, and I have a super dust deputy and bin on the way. I’m currently researching ducting because I haven’t decided if I want to build a mobile cart for the DC, or mount it to the wall and leave it stationary and install a couple runs of 5” ducting around the shop.

View therealSteveN's profile

therealSteveN

3390 posts in 1029 days


#4 posted 07-17-2019 05:57 PM

You would probably want to cut off metal for DC use at 26 gauge, at the thinnest. That 30 gauge stuff would likely cave in. at least with DC’s at serious 2 HP on up. 30 gauge is going to be ok for trunk lines when an HVAC unit is sending the gentle breeze out to the distal vents, but even still they will rattle a lot more than heavier pipe. What I found at Menards was 6” and 8” with possibility to get bigger special order. This was black pipe, and was 24 to 26 gauge. Local Lowes, and HD didn’t have this, at least in the store.

There are some critis of anymetal pipe, and some will say only Schedule 40 thick wall PVC will do. I think 26 gauge meat is fine, especially on shorter runs like I plan, and waste line thinner wall PVC isn’t going to crump any more than thick wall PVC, if you stick to the blue, and black stuff. Some of the white is ridged, and you can snap it in half, that would be a NO.

-- Think safe, be safe

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De1taE1even

44 posts in 452 days


#5 posted 07-17-2019 06:01 PM



You would probably want to cut off metal for DC use at 26 gauge, at the thinnest. That 30 gauge stuff would likely cave in. at least with DC s at serious 2 HP on up. 30 gauge is going to be ok for trunk lines when an HVAC unit is sending the gentle breeze out to the distal vents, but even still they will rattle a lot more than heavier pipe. What I found at Menards was 6” and 8” with possibility to get bigger special order. This was black pipe, and was 24 to 26 gauge. Local Lowes, and HD didn t have this, at least in the store.

There are some critis of anymetal pipe, and some will say only Schedule 40 thick wall PVC will do. I think 26 gauge meat is fine, especially on shorter runs like I plan, and waste line thinner wall PVC isn t going to crump any more than thick wall PVC, if you stick to the blue, and black stuff. Some of the white is ridged, and you can snap it in half, that would be a NO.

- therealSteveN

I put the “2HP” in quotes on purpose, because it’s widely recognized that the Harbor Freight DC is more like 1.5HP. I wouldn’t think this collector would have the power to cave in 30ga, but that’s just a hunch, thanks for the info, I’ll have to research a bit more to see if this 30ga stuff will work for me or not.

View RobHannon's profile

RobHannon

301 posts in 985 days


#6 posted 07-17-2019 06:06 PM

I am using the off the shelf 6” snaplock HVAC pipe from HD. I assume the 5” is the same gauge. I added a relief in case of a clog or turning on the system with all gates closed. I made mine, but the ones made for central vac are the same concepts and cheap enough that I would have gone that route had I known they existed.

https://www.thevacuumfactory.com/product/vac-valve-air-relief-valve-for-central-vacuum-systems-2/?utm_source=connexity

I will say that during my “tweaking” of the system I did some how manage to have the system turn on with the relief stuck closed and all my gates closed. None of my piping collapsed, but the separator I made imploded.

View De1taE1even's profile

De1taE1even

44 posts in 452 days


#7 posted 07-17-2019 06:15 PM



I am using the off the shelf 6” snaplock HVAC pipe from HD. I assume the 5” is the same gauge. I added a relief in case of a clog or turning on the system with all gates closed. I made mine, but the ones made for central vac are the same concepts and cheap enough that I would have gone that route had I known they existed.

https://www.thevacuumfactory.com/product/vac-valve-air-relief-valve-for-central-vacuum-systems-2/?utm_source=connexity

I will say that during my “tweaking” of the system I did some how manage to have the system turn on with the relief stuck closed and all my gates closed. None of my piping collapsed, but the separator I made imploded.

- RobHannon


Great info, thanks Rob. What DC do you have? 6” piping is easier to crush than 5”, so assuming your Home Depot piping is 30ga like the 5” stuff I’m looking at, I agree that I shouldn’t have a problem either.

View RobHannon's profile

RobHannon

301 posts in 985 days


#8 posted 07-17-2019 06:20 PM


I am using the off the shelf 6” snaplock HVAC pipe from HD. I assume the 5” is the same gauge. I added a relief in case of a clog or turning on the system with all gates closed. I made mine, but the ones made for central vac are the same concepts and cheap enough that I would have gone that route had I known they existed.

https://www.thevacuumfactory.com/product/vac-valve-air-relief-valve-for-central-vacuum-systems-2/?utm_source=connexity

I will say that during my “tweaking” of the system I did some how manage to have the system turn on with the relief stuck closed and all my gates closed. None of my piping collapsed, but the separator I made imploded.

- RobHannon

Great info, thanks Rob. What DC do you have? 6” piping is easier to crush than 5”, so assuming your Home Depot piping is 30ga like the 5” stuff I m looking at, I agree that I shouldn t have a problem either.

- De1taE1even

I have a 2HP Grizzly DC that is very similar spec wise to the HF model. Impeller is slightly larger. I am using a large Thien baffle separator as well. The separator does reduce static pressure in the system, so it very well may have crushed the pipe without that modification.

View EarlS's profile

EarlS

2987 posts in 2803 days


#9 posted 07-18-2019 12:01 PM

I would be interested in seeing pictures and specs for various DC setups. Maybe we need to start a DC thread similar to the workbench thread?

-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

View De1taE1even's profile

De1taE1even

44 posts in 452 days


#10 posted 07-18-2019 02:04 PM

So I did some measuring last night, and I’m pretty sure I’ll just purchase the more expensive 26ga stuff. I’ve seen on a couple other posts that some HVAC/Plumbing shops can get it for almost as cheap as the 30ga stuff from big box stores. I don’t have a ton to buy so the price difference won’t be TOO bad. I plan to run one main trunk from the front of the garage to the back, about 20ft, with 3 branches into 4” runs to the tools with blast gates. All said the price difference, even if I were to buy from Oneida, should be less than $150 so I think it’s worth it.

View farmfromkansas's profile

farmfromkansas

101 posts in 69 days


#11 posted 07-20-2019 12:13 AM

My local Ace hardware stocks 26 gauge piping in several sizes. Their prices are pretty good. They only have the pipe in 2’ lengths, would be much better in 5’ or longer lengths. Ask your local store, maybe they can get longer lengths for you.

View pintodeluxe's profile

pintodeluxe

5970 posts in 3268 days


#12 posted 07-20-2019 12:20 AM

Just special order the 26 gauge from Home Depot. While they only stock the 30 gauge HVAC pipe, they can special order the 26 gauge pipe too. That’s what I did (mostly 6” in my case, but some 5” drops) and I’m happy with it. Not as expensive as you might think.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View De1taE1even's profile

De1taE1even

44 posts in 452 days


#13 posted 07-20-2019 12:28 AM


My local Ace hardware stocks 26 gauge piping in several sizes. Their prices are pretty good. They only have the pipe in 2 lengths, would be much better in 5 or longer lengths. Ask your local store, maybe they can get longer lengths for you.

- farmfromkansas


Just special order the 26 gauge from Home Depot. While they only stock the 30 gauge HVAC pipe, they can special order the 26 gauge pipe too. That s what I did (mostly 6” in my case, but some 5” drops) and I m happy with it. Not as expensive as you might think.

- pintodeluxe


Good ideas, I’ll call Ace and HD tomorrow morning to see what my options are. Thanks!

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