A. Every habitable space shall have at least one window facing an exterior yard or courtyard or shall be provided with approved artificial light. The minimum total window area for each habitable space shall be eight percent of the floor area of the space, except for a habitable space in a basement, where the minimum shall be five percent of the floor area of the space.

B. Every habitable space shall have at least one openable window or openable skylight for ventilation purposes unless equipped with mechanical ventilation.

C. Every bathroom and toilet compartment shall comply with the light and ventilation requirements for a habitable space except that no window shall be required in a bathroom or toilet compartment if the bathroom or toilet compartment is equipped with artificial lighting and a mechanical ventilation system that discharges to the outdoors.

D. All windows of a dwelling unit that are openable and that are within ten feet of the exterior grade shall be able to be both opened and locked from the inside without the use of a key or any special knowledge or effort.

E. All windows of a dwelling unit that are openable and are accessible from the outside, regardless of height from the exterior grade, such as a balcony window or a fire escape window, shall be able to be both opened and locked from the inside without the use of a key or any special knowledge or effort.

F. Every window of a dwelling shall be kept in sound condition and good repair, substantially weathertight, and shall comply with the following: