Author Topic: Water condensing in Dryer vent duct  (Read 6547 times)

cjohnston2

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Water condensing in Dryer vent duct
« on: August 11, 2013, 08:18:54 AM »
OK.  Water is building up in my dryer vent.  I did not install this.  The dryer is in an interior space in the finished basement which is the coolest part of the house. Metal flex comes out of the driver and bends 90d, runs on the floor for 3 ft, bends 90d and goes up a wall 3 ft, bends 90d and goes into a wall.  I can’t see from here for 5-8 ft, but it must bend 90d and go up a wall to the ceiling for 4 ft and somewhere in here it changes to white plastic flex.  Then it bends 90d and runs across the ceiling for 14 ft with another 90d bend in the middle where it crosses an I beam.  Then it bends 90d and heads to the outside wall vent for 11 ft.  The total is about 35 ft and seven 90d bends.  I figure about 10 ft metal flex and 25 ft plastic.  The metal and plastic flex tubing is 4 in in diameter.

About the 26 ft mark, where the plast runs across the ceiling along an I beam where our hot water heater is, there is a plastic T that I can access and loosen the clamps and check the plastic tubing.  From this T, it rises slightly (about 3-4 in over about a 2.5 ft length) before making the 90d bend towads the outside wall.  Water is condensing between this T and the 90d bend.  I just noticed this the last couple of weeks, but suspect it has been an issue longer than that because the clothes have been harder to dry the longer we are in our weekend washing/drying process.  When I first noticed the water, the tubing was sagging and may have been virtually full of water because a lot poured out.  Since then I have been trying to drain it once a week or so at the T.   I notice no lint clogs anywhere and water only between the T and the 90d bend heading to the outside wall.  There might be 1/16th or 1/8th of lint along the plastic flex tube.

Is there anything I can do to stop the condensation short of tearing out the entire venting and redoing it with fewer 90d bends?  Would enven that fix the problem?

rickharp

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Re: Water condensing in Dryer vent duct
« Reply #1 on: August 13, 2013, 02:32:55 PM »
My first thought was the termination (wall vent or roof vent cap).  Most of the time, these terminations are the culprit of poor air flow.  Poor air flow will promote moisture buildup within the duct.  The next thing I noticed in your letter which was a big concern to me, was the plastic flex in concealed space (attic).  Major league no-no.  very inefficient and no fire protection. 

The old building code said max 25 feet of run less 5 feet for each elbow.  The new code is the same deduction but now allows for 35 feet.  So you are very much over the limit, and if and when you sell your home, the buyers "inspector" will likely require you to bring it up to code at that point.  90's are very inefficient.  Are testing showed the typical 90 produces friction loss equal to 11 feet not the 5 that the code deducts. 

I'd consider a new "route" to the exterior.  Going to a roof termination is becoming much more popular.  Hot air rises, remember.  Look at these items in our store, and watch their respective video:

http://store.dryerbox.com/DryerJack--Low-Profile--Scoop-Design_p_109.html
http://store.dryerbox.com/Premium-Flush-mount-Metal-Dryer-Wall-Vent_p_93.html
http://store.dryerbox.com/90-Degree-Long-Turn-Ell-4_p_25.html   
http://store.dryerbox.com/Model-425-Dryerbox--2x6-wall_p_16.html

Hard pipe comes in 5 and 2 foot sections and is available at Lowes and HD.  If it were me, I'd be replacing the whole run with new pipe and long turn ells.  and these Zero backflow hood caps are very impressive.  Good luck, call if I can help. 
« Last Edit: September 17, 2014, 12:01:54 PM by rickharp »
Rick Harpenau
In-O-Vate Technologies, Inc
Jupiter, FL  33477
561-743-8696

Dryerventcleaner

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Re: Water condensing in Dryer vent duct
« Reply #2 on: August 14, 2013, 04:37:09 AM »
Wow that's the equivalent of 70 feet pretty long. You say no lint is accumulating in the ducts, this is because it will be struggling to leave the dryer.

The water build up needs to be resolved its like a p-trap is any air able to exit outside the home? if I was there I would be suggesting a shorter route, replacing the plastic with rigid metal, try to reduce the number of elbows, snake the ducts that were not replaced. I would also consider stripping the dryer down to remove any lint accumulation inside the dryer, as this is where a dryer fire would start.
Dryer Vent Cleaning - Burlington, Oakville, Hamilton & Mississauga

http://www.dryerventcleaner.ca

rickharp

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Re: Water condensing in Dryer vent duct
« Reply #3 on: August 14, 2013, 08:22:00 AM »
good points DryerVentCleaner
Rick Harpenau
In-O-Vate Technologies, Inc
Jupiter, FL  33477
561-743-8696

Palspower

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Re: Water condensing in Dryer vent duct
« Reply #4 on: September 26, 2013, 07:12:39 PM »
I just cleaned a Dryer Vent with a water buildup in the vent tube. It's not always the dryer and in this case the washing machine spin cycle belt needed to be replaced.

rickharp

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Re: Water condensing in Dryer vent duct
« Reply #5 on: September 30, 2013, 07:07:46 AM »
I just cleaned a Dryer Vent with a water buildup in the vent tube. It's not always the dryer and in this case the washing machine spin cycle belt needed to be replaced.

So are you suggesting that because the spin cycle was missed or never got up to speed, that the customer would throw the wet clothes in the dryer, and the water in the clothes would exit the dryer prior to being properly evaporated?  Interesting...,
Rick Harpenau
In-O-Vate Technologies, Inc
Jupiter, FL  33477
561-743-8696