Check out your Home Center, in the heating and ventilating department, you
will find a number of different types of roof vents. Or check the web site
of the company that makes the fans, e.g.: Broan, and you will see what they
make in different sizes, shapes and types.
"JoeSpareBedroom" wrote in message
...
The previous owners of my home routed the flex duct from the bathroom fan
right to the underside of a normal roof vent and sort of wired it in
place. I'm about to re-roof the house, and although I'm tending away from
this idea, an acquaintance comes highly recommended for this kind of work.
Three person crew, all permanent people. But, while looking at the roof
with him today, he gave me a blank stare when I mentioned a vent
specifically for fans. Can anyone describe what these things look like?

Yes, I have two estimates from "real", insured companies. :-)