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Forum topic by nuckleheadbob posted 03-18-2017 03:24 PM 674 views 0 times favorited 16 replies Add to Favorites Watch
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nuckleheadbob

15 posts in 1107 days


03-18-2017 03:24 PM

Recently installed a new dust collector that required a duct upgrade. After much humming and hawing I decided to use metal duct from the Depot. I know, I know, some warn that it will collapse when the thing is turned on but my son-in- law has been using it for years with a real beast of a machine with no problems. When laying it out I noticed the wyes are all crimped on the wrong end for air coming in rather than blowing out. The question is; will this backward joint cause a significant loss of flow or I am being too anal?

-- Bob, Dogtown Richmond Va


16 replies so far

View Redoak49's profile

Redoak49

2891 posts in 1824 days


#1 posted 03-18-2017 03:36 PM

Yes, it will cause a loss as it adds significantly to the friction and disrupts the air flow. Also, you will have a buildup on the rough edges.

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nuckleheadbob

15 posts in 1107 days


#2 posted 03-18-2017 04:06 PM

Redoak49,I guess that’d the downside of hvac pipe. What I have been doing is hard crimping sections of 6in pipe to fit inside the crimped wye fittings. This makes for a real ugly joint and its hard going working alone. There must be a better way.

-- Bob, Dogtown Richmond Va

View JBrow's profile

JBrow

1273 posts in 755 days


#3 posted 03-18-2017 04:42 PM

Nuckleheadbob,

I agree completely with Redoak49.

I have used that crimping tool and like you, I hate it from beginning to end. One alternative option would be to employ a butt joint when connecting the pipes, supporting the butt joint with a draw band connector. It may be beneficial to seal the butt joint with some foil tape before putting the draw band connector in place. It may be difficult to seal against air leaks after the clamp is in place. Here is how these clamps look…

https://www.google.com/search?q=draw+band+connector&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjP97LbueDSAhUL5IMKHRk7AkYQsAQIIw&biw=1366&bih=620

If you scroll down to Overlap butt joints with draw band connectors, you can see how the draw band connector is installed…

https://www.familyhandyman.com/heating-cooling/round-ductwork-installation-tips/view-all

I would think that if finding draw band connectors locally is a challenge, it could be easily made by cutting your own from some sheet metal. At least a 1-1/2” overlap of the band over each pipe and of the end of the band would be needed for a good air seal. Although not ideal, some short zip screws could hold things together.

View Fred Hargis's profile

Fred Hargis

4756 posts in 2328 days


#4 posted 03-18-2017 04:45 PM

You could get some of the foil duct tape and cover the joints on the inside (at least some of them) to smooth things out. You might even be able to hammer out the existing crimp and put a new one on the correct end…but it probably wouldn’t be easy.

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

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nuckleheadbob

15 posts in 1107 days


#5 posted 03-18-2017 05:03 PM

JBrow, Thanks, Ive never heard of drawband connectors. We have a metal shop in town that may have them. Looks better than what I’m doing. Now to work out the blast gates.

-- Bob, Dogtown Richmond Va

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Hermit

139 posts in 1160 days


#6 posted 03-18-2017 05:04 PM

I bought a tub of the ductwork sealant and used a paint stick to apply it inside on all those joints. Give it overnight to fully dry so you don’t have a mess. I then also applied it on the outside as needed along with foil tape.

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

View Redoak49's profile

Redoak49

2891 posts in 1824 days


#7 posted 03-18-2017 05:04 PM

This is one of the reasons I went with drain pipe. Can you find a place which sells uncrimped pipe.

View nuckleheadbob's profile

nuckleheadbob

15 posts in 1107 days


#8 posted 03-18-2017 11:52 PM

Yea, having second….. and third thoughts on the metal pipe. In deep now so moving forward. If it doesn’t work right I’ll have to tear it out. If I can figure out how to post pictures I’ll do that.

-- Bob, Dogtown Richmond Va

View Jim Finn's profile

Jim Finn

2576 posts in 2757 days


#9 posted 03-19-2017 02:03 AM

You can just cut off the crimps and the beads on the wyes. Takes tin snips and one minute.

-- No PHD, but I have a GED and my DD 214

View pintodeluxe's profile

pintodeluxe

5459 posts in 2648 days


#10 posted 03-19-2017 02:26 AM

Hmm, I special ordered 26 gauge pipe and wyes from home depot, and everything fit fine. I did orient the joints for best flow in a vacuum system. If you had some that were crimped on the wrong end, I doubt it would affect performance much as long as you foil tape them.

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

View English's profile

English

576 posts in 1312 days


#11 posted 03-19-2017 08:34 PM

When I did my DC I used Home Depot Flue Wyes You have to order them, but they will ship them to your home for free. They have the crimps on the correct end.

http://www.homedepot.com/p/Master-Flow-6-in-x-6-in-x-6-in-26-Gauge-Flue-Wye-26FY6X6X6/202258555

I got my duct from Ferguson Plumbing Supply. There 26 gauge duct was cheaper than the 30 gauge that Home Depot sells.

-- John, Suffolk Virgina

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nuckleheadbob

15 posts in 1107 days


#12 posted 03-19-2017 08:45 PM

Dang it English! If I had just held off. Do they have flue elbows also? We have 4 Ferguson stores near by. Dang it! Thanks

-- Bob, Dogtown Richmond Va

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English

576 posts in 1312 days


#13 posted 03-20-2017 01:35 AM

The Elbows can be installed for either positive or negative flow, just turn it around. If you have the crimps on the inlet side of the fittings saw dust will collect on the crimps and may cause blockages.

-- John, Suffolk Virgina

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nuckleheadbob

15 posts in 1107 days


#14 posted 03-20-2017 10:20 AM

No problems with the elbows, it’s just that they are so thin. Popped a couple apart moving the pipe around. Ordered flue wyes yesterday, thanks for the info.

-- Bob, Dogtown Richmond Va

View Bumpy's profile

Bumpy

31 posts in 316 days


#15 posted 03-20-2017 11:24 AM

You can straighten the crimped end using pliers, also purchase a crimping tool, about 20.00. I have almost 100’ of 6” duct (thin wall) installed. No issues with collapsing duct or connections.

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