1. (a) The side or sides of hoistways where there are no landings shall have enclosures extending from floor not less than 72 inches high.
2. (b) The landing sides shall have self-closing sliding doors or gates or manually operated swinging doors or gates.
3. (c) Where the entrance to the elevator is on the street or outside of a building at the ground floor, it shall be provided with a self-closing door or gate not less than 66 inches in height and shall extend to the floor level across its entire width.

In factory buildings erected before October 1, 1913; in mercantile establishments in buildings erected before November 1, 1920.