A: What follows is the manufacturers description of functions - please always note the ANSI function number in any manufacturers catalog and what makes the ANSI numbers handy is that if its the same answer number for brand A it will be the same function with the same answer number in brand B, C and so on. Example an F76 by Schlage is the identical function in an F76 by Arrow.
Apartment Corridor Lock function is defined as a lock where the latch bolt operated by lever from either side, except when outside lever is made inoperative by a stop or mechanical means other than key. Dead bolt operated by key outside or turn inside. Key outside operates both bolts. Operating inside lever retracts both bolts and outside remains locked. Latch bolt is deadlocked when outside lever is made inoperative or when the dead bolt is projected. When dead bolt is retracted, lever is unlocked by stop or mechanical means other than key.
Asylum or Institutional Lock function is defined as a lock where the latch bolt is operated by key from either side. Both levers are always inoperative. Auxiliary dead latch.
Bath/Bedroom Privacy Lock function is defined as a lock where the push-button locking. The lock can be opened from the outside with a small narrow tool. The inside push button can be released by turning the insid lever.
Classroom Lock function is defined as a lock where the latch bolt is operated by lever either side EXCEPT when outside lever is locked from the outside by a key.
Classroom Security function allows control of the outside lever via key cylinders on both the inside and outside of the door. This allows a teacher to lock the classroom door during a lockdown event without opening the door and possibly being exposed to an intruder in the corridor. The cylinder on the classroom side of the door does not prevent egress; it controls the outside lever and is typically keyed so that all of the inside cylinders on classroom doors are operated by the same key or by any key in the school’s key system ("maison keying"). Classroom security locks are not restricted to classrooms and can be used in any location where key control of the outside lever is required from the inside of the room. (Doors and Hardware, May 2015, Lori Green)
Communicating Lock function is defined as a lock where the dead locking latch bolt is operated by the lever from either side. The turn button or locking device on either side locks or unlocks opposite lever. Do not use this function on doors in rooms that have no other entrance.
Corridor Lock function is defined as a lock where the dead locking latch bolt is operated by the lever from either side except when outside lever is locked by key in outside lever or by push button or other locking device on the inside. The key in the outside lever locks or unlocks outside lever. The operating inside lever releases the push button or other locking device placed in a locked position. Closing the door releases the push button or other inside locking device. The inside lever always operates the latch bolt.
Dormitory or Exit Lock function is defined as a lock where the latch bolt is operated by the lever from either side, except when the outside lever is made inoperative by a stop or mechanical means other than a key. The dead bolt is projected by the key from the outside and by turn from inside. The dead bolt is retracted by key from the outside and by the turn from the inside. Operating the inside lever retracts both bolts and the outside lever remains locked.
Entrance Lock function is defined as a lock where the unlocked by key from outside when outer lever is locked by turn-button on inside lever. Inside lever always unlocked.
Entry Lock function is defined as a lock where the latch bolt is operated by the lever from either side except when the outside lever is made inoperative by a stop or mechanical means other than the key. When the outside lever is locked, the latch bolt is retracted by the key from the outside or by operating the inside lever.
Exit Lock function is defined as a lock where the dead locking latch bolt is retracted by the lever from inside at all times. The outside lever is always inoperable.
Holdback Lock function is defined as a lock where the latch bolt is operated by the lever from either side except when the outside lever is locked from the outside by the key. The latch bolt can be locked in a retracted position by the key. When the outside lever is locked, the latch bolt is retracted by the key from the outside or by operating the inside lever unless the latch bolt has been locked in a retracted position.
Hotel Guest Lock function is defined as a lock where the latch bolt is operated by a key from outside or by operating the inside lever. The outside lever is always inoperative. The dead bolt projected by turn from inside and all keys except the emergency and display keys are shut out. Operating the inside lever retracts both bolts.
Office Lock function is defined as a lock where the latch bolt operated by lever from either side unless outside is made inoperative by key outside or by turning inside thumbturn. When outside is locked, latchbolt is retracted by key outside or by knob/lever inside. Outside knob/lever remains locked until thumbturn is returned to vertical or unlocked by key. Auxiliary latch deadlocks latchbolt when door is closed. Inside liner is always free for immediate egress.
Passage or Closet Latch function is defined as a lock where the latch bolt is operated by the lever from either side at all times.
Storeroom Lock function is defined as a lock where the dead locking latch bolt is operated by the lever from either side except when both levers are locked by ta key from either side.