For Portable AC Compatible: Exhaust hose connection.
15cm Portable Air Conditioner Window Exhaust Hose Connector with Filter Screen
15cm Square AC Window Exhaust Hose Connector Pipe Adapter
Portable Air Conditioner Window Adapter,Flat Exhaust Hose Connector | Sturdy flat exhaust connector compatible with 5.1 & 5.9 inch portable AC ducts, easy install for window vent hose connection
