Thanks everyone! Below are some responses and follow up questions based on your replies:
- the vents go to the outside, not to the garage
- the coop room is completely walled off from the garage (though there is a human door that provides access from the garage to the coop), so dust/smell shouldn't be a problem right? also note that door has a glass panel in the center (see photo in original post), so would we need to do something about that to prevent the garage lights from disturbing the chickens when it's dark out (would only happen in winter here in Seattle)?
- there is a pop door and a human door that go to the outside from the coop. when we add the run fencing, do you think we should include the exterior human door inside the run or outside of it (and why)?
- the coop room is at the opposite end of a 3-car garage from the door that goes into the house, so they are a ways away (which should help diminish the noise)
- what do you think about making it so that we can reach into the nesting boxes from the garage so that we don't have to walk in to the coop to get eggs every day? would that allow dust/smell to reach the garage?