Outside means outside, not inside your attic. In fact code defines a min
distance from other openings in the house (I think 15") and min distance
from adjascent structures. You also cannot tie into another vent.

Exausting, especially humid bathroom air, into an attic is foolish. It will
saturate your insulation with moisture making it less efficient and promote
frost and other damaging moisture related effects in the winter and cool
months. It could even directly feed mold in worst cases.

If the bath has a window that can open, that will usually serve the purpose
of a vent but area of window vs. size of room ratios may be enforced (not
sure for a bathroom but true for other living spaces)




"Percival P. Cassidy" wrote in message
...
What does "directly to the outside" mean? Can I run a vent pipe from the
bathroom exhaust fan to a point immediately adjacent to the roof vent --
on the inside of the roof?

And if the bathroom does have an "operable" window?

Perce


On 10/26/05 07:00 pm tossed the following ingredients
into the ever-growing pot of cybersoup:

Do you know what code governs your project?
Internationsl Residential Code 2003, Section R303.3 Light, Ventilation
& Heating, Bathrooms - says: Bathrooms, water closet comparments and
other similar rooms shall be provided with aggregate glazing area in
windows of not less than 3 square feet, one half of which must be
operable.
Exception: The glazed areas shall not be required where artificial
light and a mechanical system are provided. The minimum ventilation
rates shall be 50 cfm for intermittent ventilation. Ventilation air
shall be exhausted directly to the outside.