Door fastenings

In general, doors on escape routes (whether or not the doors are fire doorsets) should be either of the following.
a. Not fitted with a lock, latch or bolt fastenings.
b. Fitted only with simple fastenings that are all of the following.
i. Easy to operate; it should be apparent how to undo the fastening.
ii. Operable from the side approached by people escaping.
iii. Operable without a key.
iv. Operable without requiring people to manipulate more than one mechanism.
Doors may be fitted with hardware to allow them to be locked when rooms are empty.
If a secure door is operated by code or combination keypad, swipe or proximity card, biometric data, etc., a security mechanism override should be possible from the side approached by people escaping.