also: はめころしまど
noun
fixed window; non-opening window
A window that is permanently sealed or built into the wall and cannot be opened; often used for light or design rather than ventilation.
この部屋にははめ殺し窓しかないので、換気ができない。
This room only has fixed windows, so we can't ventilate it.
廊下の突き当たりに
There is a fixed window at the end of the hallway, letting in outside light.