I mean it's freezing out so i wasn't too worried and may tell the landlord about it when it was warmer but my only concern is, is that insulation safe for him to nest in? He spends a lot of time scratching at himself with his back paws and I worry it's irritation or something. Also it looks like he may have torn open the duct or something at some point. It's interesting watching him but I'm just not sure if it's safe for him to be living in there