200mm Diameter Exhaust Duct Quick-Release Window Connector for Spraying Setup

         This solution is for those who prioritize window sealing during exhaust to prevent gas backflow. Simply putting the exhaust pipe out means that while air is being exhausted, some external air flows back into the room, leading to indoor pollution. My home has outward-opening casement windows, so the only viable solution I found was to block it with an air conditioner draft cloth and then extend the exhaust pipe.

        However, I use it for spraying, and because the negative pressure in the enclosed space can draw air back into the room through various gaps, even the zipper and openings in the air conditioner cloth could allow paint fumes to enter the indoor space. So, I came up with a solution. In short, a piece of TPU film seals one side of the window, achieving a sealed state even with the window open (I only added a layer of mesh screen inside for safety, with an opening in the middle). Then, an opening is made in the middle to install the female quick connector, and the joints are sealed with hot melt glue and aluminum foil tape. When using the spray booth, simply connect the dedicated exhaust pipe adapter to the quick connector for a very good effect. (If you feel the seal isn't tight enough, you can add a ring of EVA foam to the end of the quick connector; pushing it in will create a good seal). I hope someone finds it useful, although I think it will be rarely needed. For spraying, I recommend choosing horizontal sliding windows; they are much more convenient. Attached are design files for a 200mm diameter exhaust pipe adapter that transitions to 170mm and 150mm (the adapter design considers wind resistance, so the angles are smoothed to significantly reduce exhaust loss caused by pipe diameter reduction).