Protection for windows over stairs, ramps and landings that extend to less than 900 mm above the surface of the treads, ramp or landing, in dwelling units in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

To limit the probability of inadequate protection under conditions of crowding in stairs, ramps or landings or for other reasons, which could lead to persons--who are pushed or who lose their balance--falling against windows, which could lead to harm to persons.

To limit the probability of inadequate protection under conditions of crowding in stairs, ramps or landings or for other reasons in an emergency, which could lead to persons--who are pushed or who lose their balance--falling against windows, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.

To supersede the minimum window height stated in Sentence 9.7.5.3.(1), where the number of occupants is low and their familiarity with the space reduces the likelihood of their falling and injuring themselves.

To expand the application of Subsection 9.8.8. to certain windows in stairs, ramps and landings.

To expand the application of the guard loading requirements in Part 4 [more specifically Article 4.1.5.15.] to certain windows covered in Part 9.