4.3.6 Hoistway Entrances
(a) self-closing or manually operated horizontally sliding or swinging, single section
(b) self-closing or manually operated horizontally swinging, two section (Dutch type) with one section above the other and the lower section extending not less than 1070 mm (42 in.) above the floor, and arranged to be opened only when the car is in the landing zone and after the upper section has been opened, and to be closed by the closing of the upper section
(c) manually operated vertically sliding counterweighted single or multisection
(d) manually operated vertically sliding biparting counterbalanced
Manually operated doors shall be equipped with approved devices to close them automatically when released by the action of heat. Self-closing doors equipped with hold-open devices shall be equipped with fusible links that will release the door in case of excessive heat.
Landing doors shall be provided with mechanical locks arranged so that the car cannot leave the landing unless the door is closed. The lock or latch shall be arranged to ensure that the door is in a position to be locked when or before the car leaves the landing.