Rooflight v roof window
BS EN 14351-1 Windows and doors. Product standard, performance characteristics. Windows and external pedestrian doorsets suggests that the term ‘roof window’ refers to a window that is in the same plane as the surrounding roof, and has a minimum pitch of 15 degrees. This is as opposed to 'rooflights' which by this definition are installed on an upstand, and so are not in the same plane as the surrounding roof.
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