Would it work to connect an exhaust fan in bathroom to the main stack (cast
pipe)?

"Jerry V" wrote in message
...
Would it work to connect an exhaust fan in bathroom to the main stack
(cast pipe)?


Absolutely not! Multiple code violations and more importantly potentially
dangerous.

Colbyt

On Mar 19, 9:14*pm, "Jerry V" wrote:
Would it work to connect an exhaust fan in bathroom to the main stack (cast
pipe)?

Not allowed.
Only plumbing is allowed to connect to the stack.

On Mar 19, 6:14*pm, "Jerry V" wrote:
Would it work to connect an exhaust fan in bathroom to the main stack (cast
pipe)?

Colbyt and Jack Hammer did not answer your question. While it is a
code violation and likely dangerous to do so, it would likely work
provided that the exhaust fan is running 24/7/365.25. ;-) Don't do it.

On Mar 19, 8:14*pm, "Jerry V" wrote:
Would it work to connect an exhaust fan in bathroom to the main stack (cast
pipe)?

That would smell real good when its off and drafting down, think about
a sewer smelling bathroom.

On Fri, 19 Mar 2010 20:14:02 -0500, "Jerry V"
wrote:

Would it work to connect an exhaust fan in bathroom to the main stack (cast
pipe)?



No. The main stack contains sewer gas, possibly explosive. Exhaust
the bath fan directly to the outside (not in a crawl space, not in an
attic space, not under a deck, etc)

On Mar 20, 8:58*am, LSMFT wrote:
On 03/20/2010 08:22 AM, Phisherman wrote:

On Fri, 19 Mar 2010 20:14:02 -0500, "Jerry V"
wrote:

Would it work to connect an exhaust fan in bathroom to the main stack (cast
pipe)?

No. *The main stack contains sewer gas, possibly explosive. * Exhaust
the bath fan directly to the outside (not in a crawl space, not in an
attic space, not under a deck, etc)

Why not the attic if it's vented?

--
LSFT

Drive a little slower than the posted speed.......
And you too can become a fracking prick.

Because an exhaust fan exhausts moisture to the outside. You do not
want the moisture to collect in the attic
and damage the wood and or insulation.
Excausting into the attic will also raise the humitidy of your house.

LSMFT wrote in message
...
On 03/20/2010 08:22 AM, Phisherman wrote:

No. The main stack contains sewer gas, possibly explosive. Exhaust
the bath fan directly to the outside (not in a crawl space, not in an
attic space, not under a deck, etc)

Why not the attic if it's vented?

The exhaust fan in a bathroom is used to vent the moisture from a shower
also, not just the smell, so you'd be throwing vapors into an enclosed space
where it could turn into mold and mildew creating other issues. Stick with
Phish's idea of direct-to-outside venting.

The Ranger

On Sat, 20 Mar 2010 08:58:17 -0400, LSMFT wrote:

On 03/20/2010 08:22 AM, Phisherman wrote:
On Fri, 19 Mar 2010 20:14:02 -0500, "Jerry V"
wrote:

Would it work to connect an exhaust fan in bathroom to the main stack (cast
pipe)?



No. The main stack contains sewer gas, possibly explosive. Exhaust
the bath fan directly to the outside (not in a crawl space, not in an
attic space, not under a deck, etc)

Why not the attic if it's vented?

The exhaust fans in my house vent an inch or two below the ridge vent
at the peak of the roof. I suppose it could have even been even with
the bottom of the vent if they had tried.

The propulsion of the air by the fan would cause it to continue up
into the ridge vent and out the holes. And the heat of the air vented
from the bathroom would cause it to rise into the ridge vent and out
the holes.

And I guess when there is any breeze, or a hot air differential, the
exhaust air would get carried along by the general air current from
the soffits to the ridge rail.

It doesn't matter for me, because I only use the exhaust fan after I
clean the bathtub, and there is no extra humidity, but the other
hundred houses are probably built the same. But I spend very little
time talking with neighbors about their houses so if this has caused a
problem, I woudn't know.

(Every ten years I need to remove a layer of milkweed from tthe bottom
of the soffett vents.)

Phisherman wrote:
On Fri, 19 Mar 2010 20:14:02 -0500, "Jerry
wrote:

Would it work to connect an exhaust fan in bathroom to the main stack (cast
pipe)?



No. The main stack contains sewer gas, possibly explosive. Exhaust
the bath fan directly to the outside (not in a crawl space, not in an
attic space, not under a deck, etc)


Why not an attic space if it's vented??

--
LSMFT

Drive slower than the posted speed.............................
And you too can become a fracking prick..............

LSMFT wrote:
Phisherman wrote:
On Fri, 19 Mar 2010 20:14:02 -0500, "Jerry
wrote:

Would it work to connect an exhaust fan in bathroom to the main stack
(cast
pipe)?



No. The main stack contains sewer gas, possibly explosive. Exhaust
the bath fan directly to the outside (not in a crawl space, not in an
attic space, not under a deck, etc)


Why not an attic space if it's vented??


That used to be SOP in the midwest, from when bathroom fans became
common, until maybe 20-30 years ago when people started sealing houses
more tightly. And in hindsight, it was a dumb idea. Even a well-vented
attic doesn't exchange the air (other than by convection) on still days,
so the chances to have excess humidity in attic (and condensation on
bottom of roof deck dripping down into the insulation) are pretty good.
Code, pretty much everywhere, requires external venting on new
construction, and it is a strongly recommended retrofit on older homes.
Trivial to do as part of a re-roof, and a good roofer will recommend it
as part of their review of the attic ventilation. (My guy said something
about the shingle warranty requiring the venting be up to standard, but
I don't know if that is true or not.)

--
aem sends...