Korean Air Conditioners?

Question

I usually post this stuff in my expat group but I'm boycotting fb completely now so I'll try this. For any fellow expats or ex-expats.... Do the ceiling mounted whisken air conditioners in S Class apartment buildings bring in polluted air from the outdoor rooms where they're connected?  If you haven't lived in Korea or don't know what an S Class apartment is, please do not reply. Real answers only.