Two lengthy dissertations will be presented, if one bothers to follow the links to a web site, where content is in pdf documents. Please trust that many will find useful discovery. In this post, I link to Panasonic bath fan installations, which include a better way to construct through-roof vents.
Please go to:
Please pick document posted 4/9/2011, Replace Bath Fan.
This parallels a blog posting and link to a Picasa Web Albums slide show: