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Air gaps not required by my local jurisdiction, just the high loop. No garbage disposal. Is there a good reason to go with an air gap instead?

I am finishing my basement. My plumbing has all been inspected and passed, but I was thinking. Some of the PEX and vent piping is in the middle of wall cavities right, and the bathroom and kitchenette area share a wall. Do I just remember not to hang shelves or anything on that shared wall...

Sorry, I am not sure where to ask this. I am putting in a basement bathroom and the fan my wife picked out is 110cfm because it has bluetooth/alexa speakers. However, it only has a 4" vent on back, and the ventilation code I could find says 100 is 10' max smooth metal, 125 is X (so no 4"...

I've tried searching and most just talk about to tub spout. I'm putting in a 3/4 bathroom in my basement, and just want to make sure I can use 1/2" PEX to a drop ear for shower head. Something like this...

So the elbow that is in the wall, can that be a normal 90? How does a sweep fit in there if not? Do you have a bit of the fitting come through wall instead of just some 1.5" pipe?

Attaching a crude rough drawing I made. To explain in words. The washer will sit in a cut out in mud room, the stand pipe (all pvc 2") will sit in the right corner, p trap, pipe after p trap 6" off ground, T to run vent through ceiling out side out house to 2' above roof line, the line after...