Projecting parts
6.1 Where parts of windows, skylights and ventilators project inside or outside a building, indicate this as shown in Diagram 6.1 or Diagram 6.2 (but see also paragraph 6.2).
Diagram 6.1 Marking by a barrier
Diagram 6.2 Marking by a surface
Spaces used only for maintenance
6.2 In spaces which are used infrequently and only for maintenance you can, for example, mark the projecting part clearly to make it easy to see.