The 2Fold® 3900 Pass-Through window is an immaculate addition to any residential or commercial project. This large scale awning type window boasts the ability to create a harmonious flow between the indoors and out. It also functions as a massive ventilation system as well. Using the 2F-3900 as a kitchen-to-patio pass-through is also one of it’s staple functions. You can easily push out this hundred pound window with ease and engage with the outside world. Awning windows create maximum ventilation in extremely large sizes with safety and security.