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Old 03-20-2019, 12:01 PM   #1
hog_down
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Default Bathroom Exhaust Fan

I recently installed 2 exhaust fans in my guest and master bathroom. I am having an issue with venting them to the outside of my house. I know better than just letting them vent into the attic. They are quiet as a church mouse when not hooked up.

The noise when I do hook them to the exhaust was borderline obnoxious. Granted, yes, I just stretched 25 feet of the foil tubing, and had it laying on top of the blown insulation, but couldn't stand the noise, so the project was put in "I'll finish it later" status. I'm guessing the little fan was working its tail off, trying to push that air through the flexible pipe.

I have reservations about drilling a hole in my roof, and installing a vent there, but it is a much shorter run of pipe to get to the outside, and probably a lot quieter. Also, I have a bathroom on the front of my house, so the vent would be clearly visible. Pic attached of the roof vent.

Any suggestions? I have watched the videos on This Old House a few times.

Thanks in advance.
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Old 03-20-2019, 12:49 PM   #2
duckmanep
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are we trying to get rid of moisture/steam from bathing or some funky bathroom odors? In my guest BR where I'm only getting rid of the stank, I vented to attic years ago and have never had a problem.
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Old 03-20-2019, 01:10 PM   #3
hog_down
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Moisture and funky odors, mainly.
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Old 03-20-2019, 01:17 PM   #4
CabezaBlanca
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Attic.
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Old 03-20-2019, 01:20 PM   #5
txhunter007
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Why not vent into the attic?
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Old 03-20-2019, 01:21 PM   #6
the marshall
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phart fans vent to attic
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Old 03-20-2019, 01:45 PM   #7
bowhntrmatt
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Those fans are intended for humidity removal, and should be vented to the outside. Only way I would vent one into attic is if it was in a 1/2 bath with only a toilet/sink. Pumping humidity into your attic can be a very bad thing under the right (wrong) climate conditions.

As far as mounting the roof vent, as long as you have a composite roof with plywood decking it is really quite easy.
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Old 03-20-2019, 01:47 PM   #8
tx_basser
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Never seen a house with fart fans vented to outside....
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Old 03-20-2019, 01:47 PM   #9
hog_down
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I'm not going to vent it into the attic, don't need any moisture up there. Trying to determine which would be easier, through the roof or out the side.

Thank you for your response, Matt.
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Old 03-20-2019, 01:50 PM   #10
xman59
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Quote:
Originally Posted by hog_down View Post
I'm not going to vent it into the attic, don't need any moisture up there. Trying to determine which would be easier, through the roof or out the side.

Thank you for your response, Matt.
going to be real hard to vent through a wall without tearing a junk of it out, then rebuilding it,,, venting through the roof will be much easier and is not hard to do
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Old 03-20-2019, 01:51 PM   #11
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If you could get to the soffit I would go there, rather than cut through roof

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Old 03-20-2019, 02:04 PM   #12
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Quote:
Originally Posted by bowhntrmatt View Post
Those fans are intended for humidity removal, and should be vented to the outside. Only way I would vent one into attic is if it was in a 1/2 bath with only a toilet/sink. Pumping humidity into your attic can be a very bad thing under the right (wrong) climate conditions.

As far as mounting the roof vent, as long as you have a composite roof with plywood decking it is really quite easy.
X2 agree with this. Keep the run as short and straight as possible, the less turns the better. These fans are not that strong and even using the flex tube hurts the air flow over smooth vent pipe.
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Old 03-20-2019, 02:25 PM   #13
elliscountyhog
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Quote:
Originally Posted by bowhntrmatt View Post
Those fans are intended for humidity removal, and should be vented to the outside. Only way I would vent one into attic is if it was in a 1/2 bath with only a toilet/sink. Pumping humidity into your attic can be a very bad thing under the right (wrong) climate conditions.

As far as mounting the roof vent, as long as you have a composite roof with plywood decking it is really quite easy.
Yup! Code also requires it to the outside unless an operable window is present and even then some cities require it anyway. We try to go to the eve of the house if not too far away. If out the roof is closer we go there.
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Old 03-20-2019, 02:27 PM   #14
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Quote:
Originally Posted by tx_basser View Post
Never seen a house with fart fans vented to outside....
Mine do...
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Old 03-20-2019, 02:38 PM   #15
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Yup! Code also requires it to the outside unless an operable window is present and even then some cities require it anyway. We try to go to the eve of the house if not too far away. If out the roof is closer we go there.
Yep, it's code. Code enforcement knows best. So, vent it to the attic.
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Old 03-20-2019, 02:44 PM   #16
JHT
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Quote:
Originally Posted by hog_down View Post
Moisture and funky odors, mainly.

Changing your diet might be an easier option.
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Old 03-20-2019, 02:46 PM   #17
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I need to install one of these in my bathroom to remove moisture.. I was thinking I would just go out the side of my house vs up through the attic/roof...whats the consensus, is that a appropriate application?
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Old 03-20-2019, 02:47 PM   #18
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Originally Posted by SaintBlaise View Post
Yep, it's code. Code enforcement knows best. So, vent it to the attic.
Do WHAT??? You must not deal with code enforcement much.. I know you're joking, but don't even type that!

I'd vent it to the attic.
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Old 03-20-2019, 02:48 PM   #19
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vent to soffit
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Old 03-20-2019, 03:15 PM   #20
elliscountyhog
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Quote:
Originally Posted by jlp04c View Post
I need to install one of these in my bathroom to remove moisture.. I was thinking I would just go out the side of my house vs up through the attic/roof...whats the consensus, is that a appropriate application?
If the eve is closer then go there to the vent of the eve. If the roof deck is closer and wood decking go there. Shortest-straightest run possible.
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Old 03-20-2019, 03:17 PM   #21
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Do you have soffit / ridge vents on your house? You'll get more humidity through those than you ever will through a fart fan.
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Old 03-20-2019, 03:27 PM   #22
duckmanep
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Quote:
Originally Posted by CabezaBlanca View Post
Do you have soffit / ridge vents on your house? You'll get more humidity through those than you ever will through a fart fan.
My thoughts as well

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Old 03-20-2019, 03:36 PM   #23
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All exhausting fan in a home should be vented to the outside. All new homes are built this way per ASHREA 62-2-16 code. If you have an existing fan or add a fan to a bathroom or kitchen vent to the outside you do not want moisture in your attic. I am in the business of building science an energy efficiency of a home just my 2 cents
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Old 03-20-2019, 03:47 PM   #24
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I vented both mine to the attic but ran the duct so that it would vent out the attic turbines. Seems good enough to me.
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Old 03-20-2019, 03:53 PM   #25
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Quote:
Originally Posted by mchunter67 View Post
All exhausting fan in a home should be vented to the outside. All new homes are built this way per ASHREA 62-2-16 code. If you have an existing fan or add a fan to a bathroom or kitchen vent to the outside you do not want moisture in your attic. I am in the business of building science an energy efficiency of a home just my 2 cents
Should listen to him ^^^

Mine are all vented to the attic.
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Old 03-20-2019, 08:17 PM   #26
CabezaBlanca
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Wet farts are worse than dry farts so you have to take that into consideration as well when trying to disperse any humidity/odors.
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Old 03-20-2019, 09:10 PM   #27
bowhntrmatt
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I have 5 total in my house. All are vented to soffit.
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Old 03-20-2019, 09:15 PM   #28
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Your attic is or should be very well vented. There would be no problem just letting it go in the attic.
Now, I have seen dryer vents terminate in the attic and that's not good.
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Old 03-20-2019, 09:19 PM   #29
wfontjr
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Only if it was real cold would you get condensation in the attic, which is not often around orange anyway. Most of the time the attic is hot and can absorb more moisture into the vapor.
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Old 03-20-2019, 09:25 PM   #30
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I vented mine out the soffit... barely noticeable unless you're right under it

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Old 03-20-2019, 09:51 PM   #31
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Both of ours are vented outside and come out in vent screens under the soffit. Looks like basically 2" pvc pipe that the exhaust runs through.
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Old 03-20-2019, 10:13 PM   #32
bowhntrmatt
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Quote:
Originally Posted by flywise View Post
Your attic is or should be very well vented. There would be no problem just letting it go in the attic.
Now, I have seen dryer vents terminate in the attic and that's not good.
Take a shower in the winter with your exhaust fan running. Vent that heated, humid air into the attic and you will literally have rain falling off your roof decking. Dryer vents are just as bad and have other issues on top of that.
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