Re: Bathroom ventilation
I have faced this problem. In my case, I was able to bore a hole in the outside wall into the end of a joist bay, and insert a 4" vent pipe (I used a flexible/expandable metal pipe) through the hole to the fan. I removed the mounting ears on the fan and mounted it flush in the ceiling, connecting the vent pipe before installing the fan. I then connected the other end to the exhaust hood and installed the hood in the exterior wall. Only two holes were needed: one for the hood and one for the fan. It was not necessary to lift the upstairs floor or cut extra holes in the ceiling.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.