(a) All openings in hoistway enclosures shall be provided with fire doors.

(b) All doors used on hoistways hereafter constructed shall be set substantially flush with the hoistway line.

(c) Sliding hoistway doors at landings of elevator hoistways shall be manually operated, self- closing or power driven.

(d) Hoistway doors at elevator landings that open and close with a swinging motion shall be manually operated.

(e) All manually operated hoistway doors shall be provided with an interlock or electric contact conforming to the specifications of sections 8-1.55 and 8-1.56 or other approved devices performing similar functions.

(f) All manually operated and self-closing hoistway doors shall be locked or latched when the car is not at the landing.

(g) Where electric contacts are installed they shall be located so as to insure the door being locked or latched when or before the contact is closed.

(h) Power driven doors shall be so arranged that they cannot be opened from the floor side except by the use of an emergency key or by other approved means.

(i) Hoistway doors shall not be openable from the floor side except by the use of a key.

(j) It shall be optional with the owner or tenant of the building to arrange the hoistway doors on any or all floors so they may be unlocked from the floor side by means of a key. To insure against the unauthorized use of a key or keys each tenant shall be responsible for the care and use of the hoistway door key or keys and he shall post and maintain a notice adjacent to each single elevator hoistway door or of each battery of elevators that will indicate how the key shall be available.

(k) The bottom landing hoistway door of every elevator shall be openable from the outside by means of a key. In addition to the keys kept by the tenants, there shall be an emergency key which shall be kept in a glass covered box adjacent to such landing which shall be immediately returned to the box and the glass replaced when the emergency ceases.