I just had my master BA renovated and the walls nearest the glass shower have water / moisture from the steam. The room is ~12X14 and has a Nutone QTN130E (110 CFM) that is located right next to the shower. For reference, the
picture frame is located in a small toilet alcove directly above the toilet. The exhaust fan is located ~ 12" to the LEFT of the picture frame and the glass shower is less than 12" to the RIGHT. The pictures clearly show the moisture. The fan is typically set for 20-30 minutes and the bathroom door is open/close 50/50 depending on time of day. I have been leaving the shower door open after use which has helped a bit but there is still always moisture on the walls.

Is this a concern?
Is this normal?
How do I get rid of the water stains?

 

There is no picture in your post.

If the room is 12 feet x 14 feet I would say the vent fan is way under sized. Also, your fan is not actually moving that much air. The 110 cfm is the absolute best that fan can do with no back pressure or resistance. When you add in the damper, duct and bends in the line it's likely moving much less air.

 

What color paint is on the walls? Dark colors tend to show water spots more than lighter colors. Occasionally the spots can be wiped/washed off but often repainting is the only fix
I agree better ventilation is needed.

 

Here's a chart show what size fan was needed.
https://www.efi.org/factoids/bathroom_sizing.html

 

It is less than 12X14 as it is an odd shape. The color is a B&M gray-ish color. Contractor said 110CFM is one of the highest residential fans you can get.