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Old 01-11-2014, 06:57 PM   #1
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Bath Fan Ducting Distance


I am adding a ventilation fan to the bathroom of my 100 year old attached house (venting options are limited). The attic is directly above the bathroom, but there is a slate roof so I prefer not to cut any slate to vent this. My only other option seems to be going around a bend to the gable end. My total distance would be about 23' with 3 elbows and termination cap. I attached a simple picture of my plan. Is this acceptable? I have a 100cfm fan.
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Old 01-12-2014, 09:00 AM   #2
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Bath Fan Ducting Distance


i am no pro, but that looks ok to me. you should angle down, slightly, the 12' and 10' run towards to outside. this will drain any condensation away from the fan.

btw. i have a dynasty 200dx, myself. sweet machine.

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Old 01-12-2014, 09:05 AM   #3
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Bath Fan Ducting Distance


May want to consult the manufacture on that one.
That's a very long run and 2, elbows will reduce the flow even more.
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Old 01-12-2014, 02:15 PM   #4
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Bath Fan Ducting Distance


Will 22' of flex ducting be a better option?

Thanks it is a great machine (Dynasty200dx)!
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Old 01-12-2014, 04:19 PM   #5
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Bath Fan Ducting Distance


If I were in your moccasins I would do my best to determine a way use PVC pipe with long radius (sweep) ells for that distance then insulate to assist in condensation prevention during cold weather.
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Old 01-12-2014, 08:38 PM   #6
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Bath Fan Ducting Distance


Quote:
Originally Posted by dynasty200dx View Post
Will 22' of flex ducting be a better option?
NO ! flex reduces the amount of flow.
do what fairview said.
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Old 01-18-2014, 12:16 PM   #7
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Bath Fan Ducting Distance


A good quality fan should have all the information you need in the instruction manual. Flexible pipe does reduce the flow, so it should be avoided. You not only have to take into account the distance of the vent pipe but also the size of the bathroom. A google search should have all the answers on what CFM is recommended. If you think it's too long of a run for the fan then up the CFM and pipe size (avoid 3", 4" minimum, 6"better). It's better to spend the money now on a quality fan instead of a cheap one that you will have to keep replacing the motor on.

And yes, insulate the pipe if it's in a cold zone (attic) or a few feet in from the wall in a warm zone (basement, between floors, etc) to avoid condensation.
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Old 01-29-2014, 07:14 PM   #8
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Bath Fan Ducting Distance


I ended up just running an insulated flex pipe and it was about 20ft total. I tested the air flow from the gable vent and it seems to work good! Thanks for all of the input.


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