This bathroom will see anywhere from zero to infrequent/average use and humidity but ideally will have a constant fan for general circulation (something like a fan that does 50CFM constant and then 110 CFM when "turned on"). I purchased 290CFM fans for both hoping I had 6" ducts, but...
The Best Time to Visit Chengdu Spring (March to June) and autumn (September to November) are the best times to travel to Chengdu because the temperatures and humidity are much more comfortable, and it doesn’t rain as often as during summer. Chengdu Wuhou Temple - Red Wall Corridor ...