Does a 1st floor bathroom with a window need an exhaust fan

[shabby]

Look up the "stack effect".

I hate exhaust fans. So effing loud. I just leave the washroom door open.

And your family loves you for that...

 

[Imp]

And your family loves you for that...

Neighbors do too, sweetheart😉.

 

[rsutoratosu]

I use the Panasonic whisper ones. 6 inch duct with motion detection. No switch needed. Fully adjustable and it's very quiet. I did not have one when I bought the house. Everything was wet after a shower

 

[alkemyst]

I use the Panasonic whisper ones. 6 inch duct with motion detection. No switch needed. Fully adjustable and it's very quiet. I did not have one when I bought the house. Everything was wet after a shower

QFT...I had a nice fan, couldn't hear it running really. The motor died and I was trying to figure out how my bathroom was so humid so long.

In troubleshooting, I figured maybe an animal or wasps/bees built a nest in my exhaust duct.

Turns out the motor died. Replaced it in a few minutes (not counting the trip to the store to pick up the motor)...dry bathroom again.

 

[Scarpozzi]

Section R303.3 2009 IRC
R303.3 Bathrooms. Bathrooms, water closet compartments and other similar rooms shall be provided with aggregate glazing area in windows of not less than 3 square feet (0.3 m2), one-half of which must be openable.

Exception: The glazed areas shall not be required where artificial light and a mechanical ventilation system are provided. The minimum ventilation rates shall be 50 cubic feet per minute (24 L/s) for intermittent ventilation or 20 cubic feet per minute (10 L/s) for continuous ventilation. Ventilation air from the space shall be exhausted directly to the outside.