Lock functions control the flow of people through a building. For more information please see below?
Entrance/Office/Classroom - may be controlled by a key in the outside cylinder, or by a thumb turn or push button/turn on the inside. The outside lever may be left in a locked or unlocked position, and the use of the thumb turn/button provides convenience to the user but may also allowed an unauthorized person to control the lock. This lock should be used where unauthorized use of the lock is not a concern – perhaps an individual office, or storage closet that does not need to be secured at all times. Latch bolt retracted by knob/lever from either side unless outside is made inoperative by key outside or by turning inside thumb turn. When outside is locked, latch bolt is retracted by key outside or by knob/lever inside. Outside knob/lever remains locked until thumb turn is returned to vertical or unlocked by key. Auxiliary latch deadlocks latch bolt when door is closed. Inside lever is always free for immediate egress.
Passage - are used where doors do not need to lock. There is no key cylinder and no means to lock a passage set.
Privacy - are used for restrooms or dressing rooms. They can be locked from the inside with a thumb turn or push button/turn for privacy, and they are typically unlocked from the outside using a tool rather than a key. There are several variations on this function, including a hospital privacy which has a thumb turn on both the inside and outside to allow hospital staff quick access to the bathroom. Some privacy functions may also incorporate an indicator to show the locked/unlocked status of the lock.
Storeroom - are used when the outside lever should be locked at all times. A key is used to retract the latch bolt and open the door; when the key is removed the door is locked on the outside. There is no means to lock/unlock the door from the inside. Typical locations for a storeroom lock would be secure storage rooms, mechanical rooms, and electrical rooms that do not require panic hardware. When a storeroom lock is specified, a door closer may also be needed to ensure that the door is not left open, defeating security.