I am putting in a very small 1/2 bath in my finished basement. I am trying to figure out the best way to vent and exhaust fan to the outside. Unfortunately, the wall that butts up to the foundation does not have a window and it sits on the opposite side of my patio steps. Of course the joist run perpendicular to that wall as well. So I can run the duct via a straight shot between the two joists to the outside.
The best solution I can come up with is to have the duct run parallel to the joist to the foundation wall which is a 6" void between the foundation and studs. Then it would drop the few inches down and run parallel to the foundation before rising 10 inches vertically to pop out to the outside. I understand that dropping duct to raise it back up is not ideal because moisture can sit. Since there is no tub or shower, just a toilet and sink, would this be an appropriate solution to my situation? Any feedback would be great!