Awing-type windows provide what percentage of opening in the ventilator area?

Awning-type windows are designed to open outward from the bottom, creating a shielded opening that allows for ventilation while preventing rain from entering. The percentage of opening in the ventilator area refers to the proportion of the window area that can be opened to allow airflow. With awning windows, when fully opened, they allow for 100% of the window area to be effective for ventilation purposes, as the entire lower portion of the window becomes an opening.

This feature makes awning windows particularly useful in situations where natural ventilation is desired while still providing protection from the elements. Other window types, such as casement or sliding windows, might not achieve the same level of openness in the ventilator area when considering how they operate.