I did not have inspections, but, I once had a very stealthy armoire.
It was a tall armoire. All ducting going out of the armoire grouped into an area in the top of the armoire. I stack some stuff on the armoire to make it look like i used it for storage.
Right at the spot where the ducting was grouped I had two Totes with lids stacked on top of eachother. They fit perfectly between the top of the armoire and the ceiling of the room. A very snug fit. I also kept a rolled up sleeping bag, and some other random shit up there. Looked pretty natural.
I drilled 4 inch holes through the top and bottom of the totes so the ducting could be ran through the bottoms and lids of both of the bins. Passive intakes were drilled (6 or so 1.5 inch holes) into the floor of the armoire and covered with ac filter type material. Light proof and filtered the intake.
My fans were mounted in the attic, so the noise was not at all an issue.
It was pretty stealthy. I didn't have many people in my room, but the few that did never noticed it.
BTW, who the fuck inspects their tenants living space? That is fucked.