There are some available but thought they seemed expensive for what they are when I looked for them a couple of years ago. They would be worth it if the window is street facing. The widow I use is on the 2nd floor, facing the back yard, so I cut 2” blue foam board from Lowe’s to fit the width of my window frame, 8” tall, and then cut a 6” hole into it for my vent hose. Then I just stuck it in the window frame, pushed the hose through the hole until it went up against the window screen, and closed the window on top of it. My method would not be a good solution if you vent outside during the winter. I vent back into the room in the winter to help keep the tent warmer and humidity up...I’m also cheap and don’t like exhausting all they heat out of the house