In order to provide visual contact with areas outside a workplace, where employees work the majority of their shift in a room of which the floor area is less than 100 square metres, the employer of such employees shaft cause every such room to be provided with windows in such a way that -
- the total glazed area of such windows is not less than three fifths of the square root of the floor area of the room, both areas measured in square metres;
- the window sills are not higher and the window heads are not lower than one and a half metres above the floor level of the room; and
- such windows are glazed with transparent material.