Custom Portable AC Window Insert for Single & Double Hung WindowsHung windows do not utilize the same window screen replacement method as hinged windows. See the video under the main product image to see how it works. Vent your portable AC through single and double hung windows without blocking your view or leaving gaps that leak hot air. This custom portable AC hung window vent kit is precision cut from durable " acrylic and sized to your exact window opening, creating a proper seal that actually keeps hot air