Universal Window Kit for Portable Air Conditioners — Everything You Need in One Box

Everything you need to get your unit venting properly — nothing to source separately. The kit includes a louvered window vent frame, steel mounting brackets, all screws and clips, and closed-cell foam sealing strips to close the gaps around the frame. That seal is what keeps hot outside air from leaking straight back in, which is the difference between a room that actually cools down and one that doesn't.

Louvered vent frame with mounting hardware included
Steel brackets and screws — no trips to the hardware store
Closed-cell foam seal blocks warm air from leaking back in
Installs in minutes, no drilling into window frames