If an elevator was installed before March 9, 1950, what is allowed regarding exterior windows in the hoistway?

The correct choice reflects that for elevators installed before March 9, 1950, there are specific allowances concerning exterior windows in the hoistway. While generally windows might be subject to stricter regulations in modern elevator systems, historical installations may retain certain characteristics that were permissible at the time of their installation.

The requirement that windows are allowed but with specific conditions indicates that there are criteria to ensure safety and compatibility with contemporary codes, even for older installations. This can involve factors such as structural integrity, the materials used in the windows, and their placement, which must not compromise the safety features of the hoistway.

The other answers suggest absolute stances either way, which does not reflect the nuanced approach that older installations might have. Simply prohibiting or allowing all windows would ignore the safety considerations and historical context of these elevators. The specific conditions ensure that any windows present do not create hazards while allowing for the practical use of the space as it was originally designed.