You can't possibly have 20 years of knowledge about anything since you read like a first grader. If you start reading from the beginning, you and the rest of the world will see that I am the one that said there will need to be 2 fans, and that YOU are the one that said; neu2you Yesterday at 5:34AM A fan is not necessary over the toilet ! Just because you stuck your foot in YOUR mouth right out the gate, doesn't mean you can start putting words in mine trying to make yourself look better. Where in the world did I ever say that "odors from the WC (in a compartment or not ) are more detrimental"?? I have said "and 80(+ cfm) just outside the shower" from the start, and "It is NEVER because people think it will get rid of the stink better that way." I also suggested a heat recovery system (remote blower) before you ever showed up. Nobody said "government knows best for us" but YOU. All I said was that "your theory of the intent of the code" was wrong. Neither the code, or myself intend to get into a debate about which area is more important to have an exhaust fan, as it is a moot point since both places are REQUIRED to have "ventilation" PERIOD. I never said I have "replaced thousands" of fans. I INSTALL thousands of fans, even now, not back at WWII. AND, they are 99% all BROAN/Nutone. So are the ones I repair or replace, including the 744. If you think 20+ years is lasting "a life time", then you are still wet behind the ears. (Neu really does suit you for a name, I bet they call you that at work) That is when most of them go out, although some go out within a couple years, depending on the habits of the inhabitants. Most people are still paying off their mortgage at 20+ years. How would YOU like it if your car was worthless and had to be replaced before it was even paid for? In contrast, I have yet to need to replace a fan less than 35 years old that is placed just outside the shower. And, what are you planning on doing for the steam you get when filling the tub with hot water, just add a third fan? SURE, you could, but these people are not just building this house "virtually" on the web. REAL MONEY doesn't grow on trees. It appears, that in your 20+ years, you have made the same mistakes for 3 houses and leave them just as things start falling apart, and you get that 7 year itch. Frankly, I would never want the extra draft you get by pulling cooler air into the shower area when the fan is in there with you.

Hi Jennifer and bac717, Thanks for your comments! I was thinking about a wet room - I would separate the shower/tub area with a glass wall parallel to the entry wall. But then I came up with the idea of a steam shower, which requires a tight shower enclosure, and the problem appeared. And no, the tub doesn't have to be angled. This is the first try - and my attempt to be cool :)

@Mrs. Pete - I have a Panasonic Whisper and it seems to be highly rated so in my limited experience, I can recommend one of their models. My designer selected the exact models based on whatever was necessary for Code and my bathroom configuration. It seems to work really well - it runs for a period of time after someone showers but is very quiet. Not sure if it's semantics but they read humidity and not steam per se so there doesn't have to be visible moisture or steam for them to operate. Originally mine were set to be too sensitive so they were going off for no apparent reason - i.e. in the afternoon when no one had taken a shower for many hours. When my HVAC made a service call on something else, he kindly adjusted it so that it was less sensitive which is fine. I am not sure why people generate so much steam. I have a moderately large shower (footprint of the original tub/shower combination with glass doors that don't completely go to the ceiling. After turning on the shower for about a minute, the inside of the shower glass becomes condensed and the temperature of the shower becomes comfortably warm. There is NO condensation on my mirrors and the fan continues to operate for awhile afterwards. The floor and walls of my shower as well as the shower glass are dry after a relatively short period of time - i.e. the next time I use the bathroom after a shower. I don't think I would want a fan IN the shower because it would be taking away the nice toasty warm being generated and the fan mounted in the ceiling outside the shower seems to work fine. I keep the shower door closed but generally my master bath door is open. I have sliding mirror glass doors immediately at the entrance to the bathroom and these have never shown the slightest bit of condensation or moisture escaping from the bathroom.

Your bathroom ventilation looks awful tbh. It shouldn't surprise you that there are some issues with it. You need to change the duct or at least clean it extensively. I had almost the same problem when I got my first apartment. The things were quite bad with the duct system and I needed to repair it. Not only that but I had to clean the tubes. I didn't know how exactly to do that, so I hired professionals in this field. I called the guys from https://epicductcleaning.com.au/duct-cleaning-melton/ and they helped me to clean the duct. Now my ventilation system works perfectly.