What are the two categories of exterior windows?

Exterior windows can be categorized primarily into fixed and operable types. Fixed windows are those that do not open; they are designed to provide light and view without the ability to ventilate. These are often used in areas where ventilation is not a concern or to enhance the architectural style of a building. On the other hand, operable windows can be opened and closed, allowing for ventilation and fresh air circulation within a building. These include various window styles like casement, double-hung, sliding, and awning windows, among others.

This distinction is critical in building design, as it influences factors such as energy efficiency, ventilation needs, and the overall functionality of a space. By understanding the difference between fixed and operable windows, professionals can make informed choices about window installations that best meet the needs of the building and its occupants.