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#4675919 - 02/23/18 09:05 PM Venting my New Dryer
Gebo Offline


Registered: 09/18/02
Posts: 1988
Loc: VA
Just purchased a new dryer and trying to upgrade my venting system. I have rigid 4" pipe on about a 20 ft run from laundry room to outside. My problem is getting from the back of my dryer to the straight run. Here are some pictures. Feel free to jump in. I HATE flex ducting. Opinions? I can't cut any farther to the right as the current cut is right up against the floor joist. I can cut more to the left. You can see my 4" rigid pipe is pretty tight as it is. The vent in the dryer will not line up with the current hole as it is more to the right and I can't cut the floor joist.





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#4675941 - 02/23/18 09:22 PM Re: Venting my New Dryer [Re: Gebo]
das_peikko Offline


Registered: 01/01/18
Posts: 414
Loc: San Antonio, TX
Interesting shape for the cutout; never seen that before. Most people like squares, rectangles, and circles.

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#4675946 - 02/23/18 09:26 PM Re: Venting my New Dryer [Re: Gebo]
Reddy45 Offline


Registered: 08/15/08
Posts: 2758
Loc: USA
I mean you can buy a bunch of rigid pipe and make it work or use flex.

Just make sure the flex is fully stretched to improve airflow.

Those seem to be the only options unless you are willing to run vent pipe inside the wall and up through the ceiling.

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#4675947 - 02/23/18 09:27 PM Re: Venting my New Dryer [Re: Gebo]
SWS Offline


Registered: 04/10/04
Posts: 343
Loc: Tennessee
Maybe I'm wrong, but it looks like 3 elbows are needed...?

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#4675950 - 02/23/18 09:30 PM Re: Venting my New Dryer [Re: Gebo]
tomcat27 Offline


Registered: 06/25/09
Posts: 3541
Loc: Chicago, IL
I think there are some swiveling ones available with some adjustment in them. that gas line sure looks twisted!
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#4675958 - 02/23/18 09:34 PM Re: Venting my New Dryer [Re: Gebo]
PimTac Online   content


Registered: 03/04/17
Posts: 3492
Loc: Soviet State of Washington
Seems like you can go solid to just above the floor then flex to the dryer. That 2x4 in the back is useless. Looks like itís detached from the stud.

Is this on a upper floor?
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#4675960 - 02/23/18 09:36 PM Re: Venting my New Dryer [Re: Gebo]
yeti Offline


Registered: 10/31/05
Posts: 1161
Loc: windsor, ontario, canada.
check out the copper line. could become a problem.
good luck with the job.
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#4675965 - 02/23/18 09:44 PM Re: Venting my New Dryer [Re: Gebo]
Gebo Offline


Registered: 09/18/02
Posts: 1988
Loc: VA
Rest easy. Copper line is non-functional. It was from 15 years ago when I had propane gas dryer.
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#4675967 - 02/23/18 09:47 PM Re: Venting my New Dryer [Re: das_peikko]
Gebo Offline


Registered: 09/18/02
Posts: 1988
Loc: VA
Originally Posted By: das_peikko
Interesting shape for the cutout; never seen that before. Most people like squares, rectangles, and circles.


My 3 year old daughter did the cutting. She did do a nice sweeping curve. She was gonna make one big circle but she hit the floor joist on that right side. grin
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#4675990 - 02/23/18 10:16 PM Re: Venting my New Dryer [Re: Gebo]
oldhp Offline


Registered: 06/28/12
Posts: 1549
Loc: USA
I think I would build a raised platform from 2"x 10"/3/4" plywood to gain more clearance for venting. Make a easy opened access panel at bottom to hook up the vent when dryer is setting there. Does the dryer have a optional bottom vent outlet? Mine did. If so you could use that outlet. Raising the washer/dryer would also help the bending over stuff. Can you return dryer and get a bottom vent if yours doesn't have one?
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#4675998 - 02/23/18 10:30 PM Re: Venting my New Dryer [Re: Gebo]
PimTac Online   content


Registered: 03/04/17
Posts: 3492
Loc: Soviet State of Washington
Just looking at it some more, I think one adjustable elbow to get it pointing up and then flex the rest of the way. Get a hinged cover plate to hide the gap where the duct comes through the floor. Covering up the rest of the hole will finish it off.
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#4676014 - 02/23/18 10:48 PM Re: Venting my New Dryer [Re: Gebo]
doitmyself Offline


Registered: 06/03/02
Posts: 6164
Loc: MI
It looks like you have a number of challenges.

- Look at the dryer owners manual to determine longest allowable vent length. It varies by brand and each elbow (90 or 45) reduces the allowable length considerably. At 20 ft. in your OP, you are getting close to maximum with any elbows. There are long vent dryer models and booster fans. Whether you use flexible metal or 3 els. described above by SWS, you need to adhere to maximum length guidelines.
- Duct hidden within walls/floors must be rigid. UL transition duct from dryer to rigid can be flexible.
- Floor trusses(not joists)..... any chance you can re route the rigid pipe in the floor trusses to come up further to the right. This would require a new hole.
- I would explore the products of companies like Builders Best and maybe Dundas Jafine to look for problem solver products.
http://www.buildersbest.com/product-industry/dryer-vent-kit/

Here's one example of UL listed semi rigid flexible transition duct:


EDIT: just noticed that the final piece under the floor is an adjustable elbow. You should be able to make it turn up a bit to allow smoother transition to the flex pipe.

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#4676015 - 02/23/18 10:53 PM Re: Venting my New Dryer [Re: Reddy45]
Linctex Offline


Registered: 12/31/16
Posts: 5718
Loc: Waco, TX
Originally Posted By: Reddy45

Just make sure the flex is fully stretched to improve airflow.


Actually - Use the all-aluminum stuff (not the shiny plastic tubing with a wire wound in it)

and leave it fully collapsed so there's no ridges inside. Use the shortest piece possible.

Evil stuff:


The GOOD stuff:
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#4676020 - 02/23/18 11:05 PM Re: Venting my New Dryer [Re: Gebo]
bruckus Offline


Registered: 02/27/10
Posts: 276
Loc: Minnesota
My last dryer allowed me to vent downward by installing an elbow This way it vents out the bottom and not the back. Maybe then it would move farther left. Just a thought. Thats how I did mine and then you can push dryer right against the wall.

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#4676047 - 02/24/18 12:12 AM Re: Venting my New Dryer [Re: Gebo]
das_peikko Offline


Registered: 01/01/18
Posts: 414
Loc: San Antonio, TX
Originally Posted By: Gebo
My 3 year old daughter did the cutting. She did do a nice sweeping curve. She was gonna make one big circle but she hit the floor joist on that right side. grin


In that case I would say it's very innovative and artistic. smile

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