Replies

1. 
   CAGIV | Sep 11, 2004 09:11pm | #1

   Is this just a fart fan in a half bath or is it a full bath with shower thats going to seem some moisture build up?

   

2. 
   BillHartmann | Sep 11, 2004 09:53pm | #2

   Why the soffit?

   with the 18" floor above it sounds like this the first floor of a 2 story house, Just vent out the side wall.

3. 
   Hubedube | Sep 11, 2004 10:03pm | #3

   Sure ,you can put the vent into the soffit, in fact, other than a sidewall , it 's the next best place to put it. It sure beats puncturing thru the roof, etc..... just make sure you install the back-draft flapper at the soffit line (these are special made "T" style flappers.) they work great. A soffit installation is best because the termination point is out of the weather, cannot get snow jammed, or rained on, and cannot flap noisily in a high-wind like the roof mounted ones do. Good luck   Hube

1. 
   BillHartmann | Sep 11, 2004 10:08pm | #4

   But can suck the moisture right into the attic through the soffit attic venting.

1. 
   Hubedube | Sep 12, 2004 12:49am | #5

    How can it ,as you say suck the moisture from the attic if its entirely pipe connected from the soffit termination point to the ceiling grille.  Your so-called logic makes no sense

1. 
   NickNukeEm | Sep 12, 2004 01:10am | #6

   I think you misunderstood him.  The moisture from the fan will be sucked into the attic via the soffit vents.  The natural draft will cycle the moist, warm air into the attic and potentially cause a mold/mildew problem.

   I never met a tool I didn't like!

2. 
   BillHartmann | Sep 12, 2004 04:48am | #8

   I said suck the moisture INTO the attic.

   If you have a properly ventalated attic with soffit vents and ridge vents then you will have a constant stream of air moving from the soffit vents to the ridge.

   Then if you have an bath fan terminating on the soffit there is a good chance that the exhausted moisture will be drawn into the attic.

1. 
   Hubedube | Sep 21, 2004 03:35pm | #10

   Bill; i understand what your claiming.

   But this air is being exhausted at a fair speed  (approx 60-100 cfm) DOWNWARD, and AWAY from the soffit pores. By the time this exhausted air is mixed and diluted with any surrounding air, it will be quite alright to enter into the soffit  area.

2. 
   MichiganDon | Sep 21, 2004 03:42pm | #11

   They make a roof vent with a flapper,even though you have to cut a hole in the roof and flash it you really want to get the moist air outside . You will never kick yourself for doing it right.

3. 
   DanH | Sep 21, 2004 04:46pm | #13

   If you're that concerned about it, just don't put any soffit vents near the fan exhaust port (or block any continuous soffit vents near the port).

2. 
   AXE | Sep 12, 2004 02:59am | #7

   Is this the soffit termination that you are talking about:

   http://www.fantech.net/accessories4.htm

   See "UEV 4" about halfway down the page.

   As far as going to a sidewall, I could do that but I don't want to because it's the street facing gable and I don't want that to look like crap.  I could go to another sidewall but that run is 20' or so, when the gable soffit can be had for almost nothing.

   The fan is going to be for a guest bathroom, so long term moisture isn't a huge concern, but no sense in not dropping it all the way to the soffit.

   I like the point about drawing moisture right back into the attic, except I don't have one.  I have no real walls on the second story, just a 12/12 roof down to the floor system.  I plan on making all that space unvented cathedral ceiling using polyurethane foam spray insulation.

   MERC.

1. 
   BillHartmann | Sep 12, 2004 04:51am | #9

   Sorry on a gable end you won't any soffit vents anyway. And if it is an unvented roof then it would not be a problem even if it was not on the gable end.

2. 
   Hubedube | Sep 21, 2004 03:42pm | #12

   Yep, the UEV 4 will do the job.  The power of the fan force will "throw" the exhausted air 'down and away' from re-entering immediately. Of course new air will come back into the soffit, but it will not be the moist exhausted air.