I have read the Lowes.com page:
http://www.lowes.com/lkn?action=howT...HeatingCooling

I discovered when I took off one of our eavestroughs that the fascia board
was quite rotted in one small area. When I remove the rotted section I
discovered this:
http://eteamz.active.com/amtrakfastb...soffitvent.jpg

The bathroom fan wasn't completely vented to the outside! (There is a soffit
vent under the pipe elbow, but the elbow isn't directly connected to the
soffit vent).

My question - what kind of soffit vent do I use to attach to the pipe elbow?

Howie