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Old 02-02-2011, 02:39 PM   #1
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Vent a Dryer through a Flat Roof or run 21' out the wall?


Right now my dryer vents into the garage... which is very... very bad.
I am currently remodeling my kitchen and dining room where the washer/dryer is. So now is the perfect time to fix this problem.

I have 2 options...
1. I can run a 4" line with 3 90 degree elbows about 22' around the inside of the garage to an outside wall.
OR
2. I can run straight up with 1 90 degree elbow right out the roof.
However, it is a flat roof... so I dont know how this will work.

What is my best option?

Thanks all!
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Old 02-02-2011, 03:48 PM   #2
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Keep in mind, that each 90 adds around five feet to the run. I would run the duct through the garage, but insulate it, or box it in and insulate it. You will have to seal the joints with duct mastic since it is running through the garage. If running up through the roof, you need to use the proper vent on the roof, and also have a damper installed inside to close the vent when the dryer is not running. Again, would need to insulate the duct & seal all joints.



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Old 02-02-2011, 09:47 PM   #3
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I would check the manufacturers duct length on total footage.

I would call your local B.D. on gauge of metal for the garage ducting or hole flashing at the wall. Also any other local requirements they may have.
DIY on a flat roof penetration may be difficult especially if any snow load...


Gary
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17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
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Old 02-02-2011, 10:43 PM   #4
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Today I've got a 16" snow load on the roof... I don't have any local codes as I live in the country middle of no where.
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Old 02-03-2011, 09:36 AM   #5
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For such a long run to the outside wall you may need a Dryer Vent Booster:
http://residential.fantech.net/resid...-booster-fans/
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