A Falcon IC hotel (faculty restroom) cylinder has a small post on the back that will only allow the cam to rotate in one direction; it is a handed cylinder. The emergency key is a longer key that pushes the cam out past the small post and allows it to rotate in either direction which permits the emergency key to gain access when the door is locked.
Part numbers:
C262 - Falcon IC Mortise, 6 or 7 pin, hotel function, RH
C265 - Falcon IC Mortise, 6 or 7 pin, hotel function, LH
KB737 - Falcon IC Mortise, 6 or 7 pin EMERGENCY keyblank (standard)
KB738-1 - Falcon IC Mortise, 6 pin EMERGENCY key (standard)
KB738-2 - Falcon IC Mortise, 7 pin EMERGENCY key (standard)
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