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tetuanrp 08-13-2011 01:13 PM

Ventilation for Bathroom Fan?
I am remodeling a bathroom, I removed the old ventilation fan in the cieling to replace it - and realized the vent wasn't actually venting anywhere outside! Is that normal?

So when installing the new one, I don't have a duct to exhaust the air too. Should I still install it? Or should I call a contractor and have a duct installed. Trying to do it reasonably inexpensive.


VIPlumber 08-13-2011 01:18 PM

Unless you want to create a mold farm in your attic, then the bathroom fan must be vented to the outside.

diyorpay 08-13-2011 03:22 PM

The cheap dryer kits that are sold will do the trick in your case. Get right diameter. You will need to drill a hole in an exterior attic wall, install the usually plastic damper/flap from outside and connect the flex tubing between fan unit and the flap.

Also crack the window to assist air flow when fan is on.

tetuanrp 08-13-2011 03:51 PM

Sounds good. Its a multi unit complex so may need to check with HOA. I have easy access to outside wall and roof is above. Just don't have the tools to cut through the wall.

REP 08-14-2011 12:52 AM

OK some things to think about.
As already mentioned you don't want moisture to be vented anywhere near wood.That is a health concern as it is a perfect situation for mold and wood rot.
You want at least a 100 cfm fan for a normal sized bathroom.It should be on at least a 10 minute timer.The fan itself should be Energy Star rated..
While plastic venting is nice,I perfer alum. pipe instead as the airflow is greatly improved with "hard" pipe and the moisture won't rust it out.

josall 08-14-2011 08:02 AM

You can buy at lowes or HD See installation instructions.

diyorpay 08-14-2011 09:23 AM

Also at Lowes, and considering that poster wants "reasonably inexpensive", cutting a wall is much easier than a roof:

secutanudu 08-14-2011 09:32 AM

Get yourself a panasonic bath fan, they are far superior to ANYTHING sold at HD or Lowe's.

REP 08-15-2011 01:50 AM

I agree.The Panasonic unit is the best I've seen.
It is also true that Broam and Nutone have come a long way from the 80's.
They all make Energy Star rated fans and 100 cfrm and are all a lot quieter than they used to be.

tetuanrp 08-15-2011 03:10 PM

This is what I got from HD:

It's a guest bathroom that doesn't really get used, so need something basic for around $100.

I also see they make Ductless fans? That would solve my duct-work issue, but just wondering what the point of it is then:

REP 08-15-2011 04:28 PM

I view the ductless fan as a totally useless product.
The big thing is it does not get rid of the moisture which causes mold and wood rot.
It might help with the odor but charcoal only absorbs so much odor before it has to be cleaned or replaced otherwise it just recirculates the odors.
The other one looks OK but it is only an 80 cfm fan,good for a small bathroom.No sense in installing a unit that will not do the job.

tetuanrp 08-15-2011 05:10 PM

Yep, small bathroom (with a window), so should be plenty. Thanks all!

secutanudu 08-15-2011 05:28 PM

How much was the fan, this panasonic is about $100 plus shipping:

And it's 0.3 sones (noise level) as opposed to yours at 2.0 sones.

tetuanrp 08-15-2011 11:05 PM

Yeah, if I were to do it again I'd get a panasonic. Now I'm just wanting to get this project over with! Do you know if they sell those for that discount in stores? If so I could pick one up before my contractor comes tomorrow. Tight on timing!

secutanudu 08-16-2011 06:30 AM

I doubt you can get one that cheap in a store, you'd have to spend a bit more.

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