venting bathroom to sunroom

[w***@yahoo.com]

I have a house built in the early 70s in Northern Virginia. Two
bathrooms are on the second floor and do not have conventional venting,
only windows. The windows used to open to the outside, but the
previous owner converted the second-floor deck into a sunroom, and now
the two bathroom windows open into the sunroom. The sunroom is about
10' x 30', is unheated, and has large windows to the outside that are
usually open on three sides. It has very good ventilation except in
the middle of winter, when we close the windows. The attic is
immediately above the bathroom and sunroom.
I would like to add ventilation fans for the two bathrooms. The
easiest way to do this would be to mount them on the wall to the
sunroom, and vent the air directly into the sunroom. Is this an
acceptable way to do it? Another option is to run the ducts inside the
wall, down and out to the outside below the deck/sunroom. A third
option is to run the vent into the attic and out the ridge vent at the
peak of the roof. Is this possible? I saw it done in my old house.
So far I have no soffit vents for the attic, but will be adding them
shortly. Soffit vents would be hard to get to, except over the
sunroom, if I put any there.
What is the best way to go about doing this? Should I just vent
into the sunroom, since it is large and usually open, or do I need to
do something more complicated? Thanks for all help.

[DanG]

The only proper answer that can be given is to pipe the vents to
the exterior. The attic route sounds the best to me. All fans
have a limit of piping that can be installed on them, every turn
and twist requires deductions from this footage. Long horizontal
runs are hard to do, and may require in-line booster fans.

Most residential fans push the exhaust. Most commercial fans pull
the exhaust by placing the fan on the roof and pipe to the room(s)
with an exhaust grille system. The control wiring is longer, but
no more complicated.

(top posted for your convenience)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Keep the whole world singing . . . .
DanG (remove the sevens)

Post by w***@yahoo.com
I have a house built in the early 70s in Northern Virginia.
Two
bathrooms are on the second floor and do not have conventional
venting,
only windows. The windows used to open to the outside, but the
previous owner converted the second-floor deck into a sunroom,
and now
the two bathroom windows open into the sunroom. The sunroom is about
10' x 30', is unheated, and has large windows to the outside
that are
usually open on three sides. It has very good ventilation
except in
the middle of winter, when we close the windows. The attic is
immediately above the bathroom and sunroom.
I would like to add ventilation fans for the two bathrooms.
The
easiest way to do this would be to mount them on the wall to the
sunroom, and vent the air directly into the sunroom. Is this an
acceptable way to do it? Another option is to run the ducts
inside the
wall, down and out to the outside below the deck/sunroom. A
third
option is to run the vent into the attic and out the ridge vent at the
peak of the roof. Is this possible? I saw it done in my old
house.
So far I have no soffit vents for the attic, but will be adding them
shortly. Soffit vents would be hard to get to, except over the
sunroom, if I put any there.
What is the best way to go about doing this? Should I just vent
into the sunroom, since it is large and usually open, or do I
need to
do something more complicated? Thanks for all help.

[rider89]

if you vent into the sunroom when the windows are closed, you will get poor
air volume flow,
and massive amounts of condensation on the inside of the sunroom windows.
much better if you vent outside.

bill

Post by w***@yahoo.com
I have a house built in the early 70s in Northern Virginia. Two
bathrooms are on the second floor and do not have conventional venting,
only windows. The windows used to open to the outside, but the
previous owner converted the second-floor deck into a sunroom, and now
the two bathroom windows open into the sunroom. The sunroom is about
10' x 30', is unheated, and has large windows to the outside that are
usually open on three sides. It has very good ventilation except in
the middle of winter, when we close the windows. The attic is
immediately above the bathroom and sunroom.
I would like to add ventilation fans for the two bathrooms. The
easiest way to do this would be to mount them on the wall to the
sunroom, and vent the air directly into the sunroom. Is this an
acceptable way to do it? Another option is to run the ducts inside the
wall, down and out to the outside below the deck/sunroom. A third
option is to run the vent into the attic and out the ridge vent at the
peak of the roof. Is this possible? I saw it done in my old house.
So far I have no soffit vents for the attic, but will be adding them
shortly. Soffit vents would be hard to get to, except over the
sunroom, if I put any there.
What is the best way to go about doing this? Should I just vent
into the sunroom, since it is large and usually open, or do I need to
do something more complicated? Thanks for all help.