ASHRAE Building Commissioning Professional (BCxP) Certification Practice Test

Fenestration refers to openings in the building envelope that allow light or sight through, such as windows, doors, and skylights with glazing. The example of a door that is more than half glass fits because it creates an exterior opening with a substantial glass area, providing visibility and daylight into the interior. The other options are solid, non-opening surfaces or lack glazing, so they don’t constitute fenestration.