difference between lever and night latch

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The old Falcon M lock had 2 lever styles that were very similar in appearance; the Kim and Sutro.   The Kim lever was hollow with a plug on the end of the lever while the Sutro was solid (alumi...
Night Latch (NL)= key retracts the latch momentarily to allow entry. When key is removed, the latch will extend and locks the door (momentary unlock). Class Room (Lock/ Unlock)= key unlocks...
To convert the Von Duprin 9975NL(Night Latch or Storeroom) to 9975L (Classroom) exit function follow these steps (Note: the mortise lock is shipped as Night Latch from the factory): Turn the NL ...
To convert the Von Duprin 9975L to 9975NL exit function follow these steps (Note: the mortise lock is shipped as Night Latch from the factory): Turn the NL screw on 7500 mortise lock counter clo...
The 93 style lever was discontinued in the third quarter of 2009. If replacing the 93 lever the closest design is the 03 lever.  
The differences in the levers are: The 93 used a conical bushing as the diameter was smaller than the 03 lever and was manufactured from bar stock The 03 uses a straight bushing and is cast Le...
The old D-Series Lever used a standard lever insert similar to the pre-2002 AL-Series standard lever insert.  The old D Lever insert was smaller than the AL and the two were not comp...
The MA lock is field reversible.  The process involves three potential steps depending on what hand is needed. Rotating latchbolt - Changes swing of lock.  ex (RH to RHR) or inswing vs outswing ...
There are two main differences:The bottom latches are differentThe Von Duprin 98/9947 concealed vertical rod device covers up to 1/4" undercutThe Von Duprin 98/9948 concealed vertical rod device co...
They both use Template # 10320_c