Elite Pop Up Windows They can come with or without a sill .. The Avora Pop Up Window uses pneumatic hinges to pop up the window, automatically locking it into place at 90 degrees. This trendy window is easily installed by almost any handyman. Custom sizes available. Aluminum Pop Up Windows : Thermal break frame Thermal break glass Double Pane German Hardware Tempered Glass 25 Year Warranty on Glass and Frame 10 Year Warranty on Hardware We do custom sizes