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Old 10-05-2019, 06:24 PM
 
Location: Where there is too much snow!
6,078 posts, read 11,109,784 times
Reputation: 2924

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We've just recently added on a 12' 30' addition to a home. So, this leaves me with a delima.
How can I run the dryer vent pipe across the additional 12' span?
I had a employee of Home depot tell ME to use a PVC 4" pipe, "I've done it for years with no problems", as he said. I looked it up and that is a major no no by building code and fire safety.
So, what do I do to connect the dryer to the outside vent trap (SAFELY).
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Old 10-06-2019, 07:51 AM
 
3,247 posts, read 3,333,516 times
Reputation: 3881
You should probably ask this question in the 'House' forum. Folks there respond to questions like this all the time.


The dryer vent in my house has a verticle run up through the roof using some kind of plastic pipe (I believe CPVC but would have to go out to the garage to look at it to be sure) It was installed when the house was built in 1975 and passed inspection then. Home inspector didn't have any problem with it when we bought in 2003.


In a previous house I got tired of our dryer venting into the garage and extended it across the width of the garage using 4" metal duct. What scares me is people who use vinyl flex duct to connect the dryer itself up to the permanent ductwork! Nothing you do could be worse than that.
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Old 10-06-2019, 09:27 AM
 
Location: Where there is too much snow!
6,078 posts, read 11,109,784 times
Reputation: 2924
I think your right about which thread it should have been in the house thread.
In 75 they did many things that won't pass inspection now. Besides, I've found that most home inspectors have no idea what they're doing, because they have never actually built a home.
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Old 10-06-2019, 03:00 PM
 
Location: Connecticut
27,104 posts, read 43,070,393 times
Reputation: 8135
This thread is off topic to the Architecture forum so it will be moved to the House forum where it will get more responses. JayCT, Moderator
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Old 10-06-2019, 05:53 PM
 
Location: Johns Creek, GA
12,891 posts, read 49,865,304 times
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Max length is 35'.

But! Yes there's a but- you have to count elbows as 5'. This is 4" solid metal ducting, except for the flex to connect dryer to the duct.
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Old 10-06-2019, 06:12 PM
 
Location: Lone Mountain Las Vegas NV
13,793 posts, read 5,263,675 times
Reputation: 6095
Quote:
Originally Posted by K'ledgeBldr View Post
Max length is 35'.

But! Yes there's a but- you have to count elbows as 5'. This is 4" solid metal ducting, except for the flex to connect dryer to the duct.
Here is a This Old House How to on the subject...


https://www.youtube.com/watch?v=mKLot_EgcJw
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Old Yesterday, 01:31 PM
 
Location: The Berk in Denver, CO USA
14,266 posts, read 20,881,601 times
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Ventless dryer.
Done.
Condensing heat pump for maximum efficiency.
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Old Yesterday, 04:49 PM
 
Location: Eastern Washington
14,562 posts, read 45,600,088 times
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Quote:
Originally Posted by davebarnes View Post
Ventless dryer.
Done.
Condensing heat pump for maximum efficiency.

This, or maybe re-route your exhaust so it does not have to cross the 12' space of your new addition. You do want to minimize the amount of turns and elbows in the duct. Yeah, plastic PVC is not a good idea for this.



I live in a dry climate and never use more than the "delicate" heat setting, so I am not losing that much by not having a condensing dryer. But if you live in a humid climate and you dry a lot of clothing, depending on your electric rates, it could pay for itself pretty quickly. You can sell your current dryer if it works more or less right.
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Old Yesterday, 09:33 PM
 
Location: Johns Creek, GA
12,891 posts, read 49,865,304 times
Reputation: 14849
Quote:
Originally Posted by davebarnes View Post
Ventless dryer.
Done.


Maybe; in some circumstances.
I've been on several boats that have both ventless dryers and the combo washer/dryer which is also ventless- most owners say they're garbage. They usually hang laundry on the lifelines and it's dry in about an hour. Compared to the 3-4 it takes with those selfcondensing ones.
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Old Yesterday, 10:03 PM
 
381 posts, read 88,007 times
Reputation: 748
Quote:
Originally Posted by K'ledgeBldr View Post
Maybe; in some circumstances.
I've been on several boats that have both ventless dryers and the combo washer/dryer which is also ventless- most owners say they're garbage. They usually hang laundry on the lifelines and it's dry in about an hour. Compared to the 3-4 it takes with those selfcondensing ones.
They'll work in really low humidity environments. If it's humid, they're a waste of time.
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