ANSI/BHMA code F13 Corridor/Dormitory function.
Latch bolt retracted by lever/knob from either side. Deadbolt retracted by key
outside or inside thumb turn. Throwing deadbolt locks outside lever/knob.
Operating inside lever/knob retracts deadbolt and latchbolt at the same time,
and unlocks outside lever/knob. lnside lever is always free for immediate exit.