Which type of window does not open?

The type of window that does not open is the fixed window. Fixed windows are designed to provide views and allow natural light into a space while remaining stationary. They are often used in situations where ventilation is not needed or desired, such as in high-rise buildings or in certain architectural designs where functionality is prioritized over operability. Because fixed windows do not have moving parts, they typically offer better insulation and energy efficiency compared to operable windows. This design choice is often utilized in combination with other types of windows that do open, allowing for a harmonious blend of aesthetics, light, and airflow.

In contrast, operable windows, sliding windows, and casement windows all have mechanisms that allow them to be opened and closed, enabling ventilation and airflow control.