Bath vent. Where to exit exhaust????


  #1  
Old 12-28-11, 11:59 AM
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Bath vent. Where to exit exhaust????

Hi.

I removed a light fixture to install a bath fan. I should of done it when I added the dormer but I am a bit dumb at times.

I figure it has a window....Doh!!! Opening it in the winter is not a option for the kids...LOL

Who knew my 11 yr old would like hot steamy showers.

So to save the walls from peeling I got this far today. The walls literally drip with condensation so I had this planned for about a yr now..

I removed the light and cut the opening for the fan today and am am debating on where to exhaust.

7x7 bath, 80 cfm, 2.5 scones. Bought dryer vent exhaust for transition.

Here is the bath.

[IMG][/IMG]

Here is soffit side.

[IMG][/IMG]

Here is window side.

[IMG][/IMG]


I really dont want to go through roof so not really an option. The soffit side is the easiest but I think it may be wrong or look dumb. I could go under the eave but I did not see any device with a self closing door like the dryer vent kit.


Thanks in advance for any help.

Mike NJ
 
  #2  
Old 12-28-11, 12:11 PM
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I'd go for over the window. No flex vent, all rigid and well insulated to avoid condensation. The fascia board location (soffit) is also right above that vent pipe. If that is a stink pipe you should add it to your list, to-be-extended.

Bud
 
  #3  
Old 12-28-11, 12:38 PM
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No flex vent
It has to be flex. No attic space. Its a cape.

The fascia board location (soffit) is also right above that vent pipe.
If that is a stink pipe you should add it to your list, to-be-extended.





Yes extend to where??? No its staying like that. The only thing I am going to do is put an elbow on it possibly. The rain from the roof drips right into the vent...LOL And I am on a septic. But I dont believe that much water falls in a 4 " opening.

I'd go for over the window.
Why do you suggest this? Is it only the vent pipe? Or is it hokey looking!!!

The ceiling joists run left and right in pic #1 so like I said soffit side would be easiest for me and keep the pipe under the insulation.

Mike NJ
 
  #4  
Old 12-28-11, 01:19 PM
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Technically, maybe just an ice problem, if you ever get ice. I have never tried to go out the fascia board. Some go out the soffit below, but that air can be pulled right back into the attic. On a dormer, I don't know if your soffits are vented or not.

Bud
 
  #5  
Old 12-28-11, 01:34 PM
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Soffits not vented.
I would stick a drill in the ceiling and drill a pilot hole out the fascia. Then drill from the outside in.

On the window side I would just drill above the window.

Like I said the soffit side will be in the bay and I can keep the insulation on top. On the window side the duct will be above the joists.

Hmm. I will search online some.

Mike NJ
 
  #6  
Old 12-29-11, 02:40 PM
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Yeah, it did not work out too good. Idrilled the facia and it was not large enough for 4".

I butchered it really.

I need to replace that facia board. It looks white and not painted. I will go to the home store and look.

or I can get a 3" vent. and try to fit it. I cut a big chunk out though.

Or I can fix that and get a under eave but I see no draft door on those. But now that I have a hole I can see a under eave will work out fine. But I am conserned with the sewer gas thing now that I see where I can out the facia. Directly ove the vent.

or go out over the window after I repair the facia but if I screw that up then I will have a hole in the side of the house too that I probably cant fix..

Well I already have a hole so....Uggg.

I should have just left the light.

" I am not a carpenter "!!!!!!! Ahhhhhhhhh

Mike NJ
 
  #7  
Old 12-29-11, 07:10 PM
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First 80 cfm is very small for 7x7. I'd want at least 110 cfm. I'll post a pic of the vent u should get.
 
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Old 12-29-11, 07:13 PM
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  #9  
Old 12-29-11, 07:27 PM
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I sized it as follows.

How to Size a Bathroom Ventilation Fan - iaqsource.com

Calculation said 52 cfm. I went with 80cfm.

This eave one looks better no?

Amazon.com: Under Eave Vent, 4": Home Improvement

Mike NJ
 
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Old 01-02-12, 12:49 AM
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Bud you say right that technically an ice problem, if you ever get ice.
 
  #11  
Old 01-04-12, 01:07 PM
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OK I could just say it was a nightmare. Where I drilled there was a stud in the way. Drilled right through that. There was some other wood in there also that I drilled out..etc...

All because I could not see enough by sticking my head in the fan opening. If I drilled 6" up and 6" to the left or right I would have been golden.

It was murphys law I tell you.

Anyway I repairs the facia that I hacked into a few days ago. Bought a new piece and replaced it.

Here is finished jod. I can also say that there is no more rain on my walls...LOL. No steamy mirror at all. So 80 cfm works with a 7x7 bath.

Pic shows fan running with flap open.

[IMG][/IMG]
[IMG][/IMG]
[IMG][/IMG]
[IMG][/IMG]



Now off the finish kitchen remodel...LOL


Mike NJ
 
 

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