Which of the following options is included in the category of fenestration?

Fenestration refers to the arrangement, proportioning, and design of openings in a building, which typically includes windows, doors, skylights, and other structures that allow light and air into the interior of a structure. The term encompasses both transparent and translucent elements, meaning that any openings that provide views or allow for the passage of light fall within this category.

The inclusion of skylights in the category of fenestration is significant because they serve as openings in the roofing system that allow natural light to enter, similar to how windows function on walls. Additionally, both opaque and glazed doors are considered fenestration elements. Opaque doors are generally solid and do not allow light to pass through, while glazed doors have glass panels that do. Both contribute to the overall light and ventilation strategies of a building.

Vertical windows clearly fall within the traditional understanding of fenestration, as they are specifically designed to allow light and views from outside the building. Roof overhangs, while not an opening themselves, are part of the architectural design that can influence the performance of fenestration elements by providing shading and weather protection.

Given this comprehensive view of what constitutes fenestration, it is evident that all the listed items—skylights, doors (