We have a small full bath (shower and no tub) upstairs in our log home that has no fan installed. The room is about 8 x 6 with a vaulted ceiling to the roof. My wife and I have got by for years by opening the window when we shower, but the room still does get some mildew that needs to be cleaned from the walls a few times a year. Now that my kids are getting older and are graduating from baths (the downstairs bath has a tub and also no fan) to showers the upstairs bath is getting a lot more use which will undoubtedly create more mildew problems. Since there is no attic and because we live in the cold and snowy northeast a ceiling vented fan is not a good option. Has anyone found a good wall vent fan that works well in a bathroom? What has everyone else done as far as venting bathrooms in log homes?
Due to my experience it is better to order local service in this question. I think the main problem is not in fan...you need some changes in your air track. Have such problem in my bath...change my flooring 2 times because of mildew... this company helped me with my air condition. 2 years passed -all is ok!
Our situation sounds nearly identical to the one you describe. I am curious to know what you decided and how things worked out?
Though dryers are essential they might breakdown and malfunction. This can easily be avoided. Lint clogged dryer vent is a potential cause for fire as it may cause dryer to take twice as long as to dry. A congested dryer vent exhaust can cause fire hazard with lint buildup. Always have a fire plan ready for your home http://www.apialarm.com/blog/fire-safety/create-perfect-fire-escape... .
Home security alarm services claim that corrugated exhaust vent is degrading and is no longer accepted by city codes and can cause leaks and fires. I would personally suggest you to replace older materials with semi- rigid metal ducts. Same with loose gas ducts.