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Resolution: 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...:

What is the difference between Night Latch (NL) and Class Room function?

Resolution: 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...:

What is a communicating frame?

Resolution: Communicating Frames are hollow metal frame fabricated such that a door is installed in each rabbet of a double rabbeted frame (2 doors total) to facilitate dual access and control of the opening, ...:

What is the cylinder part number for an ND-Series lock?

Resolution: ND-Series Cylinder Reference Table Function Door Thickness Cylinder Mechanism Complete Cylinder Non-Hotel Functions Standard Conventional 23-065 Primus 20-765 Pri...:

How do I change the function of the Von Duprin 7500 mortise lock from Lever ( classroom ) to NL ( night latch )?

Resolution: 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...:

Can an 18-R-L be converted to L-NL function in the field?

Resolution: Follow step 6 of the 18-R instructions to convert trim function to Night Latch(L-NL).: