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According to the plans, it looks like we need lighted versions, so here's a possibility:
This sucker (Ha! This sucker is literally a "sucker"!) runs at 0.4 sones at 62 cubic feet per minute and less than 0.3 sones at 80 cubic feet per minute. According to this guy, ceiling mounted bathroom fans are typically 1.5 to 5 sones, so 0.3 to 0.4 sones is 4 to 50 times quieter. Not bad. But like most things in life [insert large sigh here], this comes at a cost. The list is $311 (but can be found for half that).
It also comes without the light:
at a wee lower price ($250 list; $137.50 market).
I've read good things about NuTone fans and they are supposed to be less expensive. This lighted one is at 0.4 sones:
But oof that thing is ugly! And with a list of $266 and a market of $146, the savings aren't all that great.
For comparison's sake on sound, heres a standard fan from NuTone:
which runs about 3 sones (7.5 to 10 tens louder than the Panasonic!) and is about $60.
NuTone also makes a value fan you can pick up at Home Depot for the delicate price of $13.97:
NuTone also makes a light-fan combo that looks like a can light, something the architects have specified for the master bathroom pooper closet for $134:
Not sure why the architects specified this for the master pooper and something else for the other two bathrooms (seems half dozen of one and two of the other...).
Also noticed that the master only has a fan in the pooper closet. Seems like there should be one in the shower area as well to remove moisture...
If we want to sever the light from the fan, we might-could go with Aero fans. Check out this one with less 0.3 sones:
which also comes in a square version:
They retail for about $200 a piece and market for $125.
EVEN MORE FANS!!!
Now this Broan NuTone (QTXEN110FLT) is kinda cool (~$200):
and it runs at 0.3 sones.