But there IS a sliding glass door there. The only thing that isn't clear is whether the door seals tight or not... the ceiling track makes it look like it doesn't fall flush with the shower wall, in which case yeah there's no stopping them butt fumes.
Yeah I saw the slider after I posted, but it doesn't look like it does much for any sort of... blockage. They need a disclaimer not to stay here if you plan on going out for a night of beer and tacos.