what does MK stand for door hardware?

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The 4041 Rw/PA and the Hw/PA have the same template.  The only difference is the arm. The 4041/4040XP Hw/PA, if mounted to the 180° template, will hold the door open at 180°. Rw/PA is Regular A...
Regular LCN closers have "3" regulating valves for General Speed, Latch Speed, and Backcheck. If the LCN closer has "4" regulating valves, then the closer has the Delayed Action feature. De...
When dealing with glass lights in doors, there are three (3) critical dimensions which must be coordinated: Exposed Glass Size (EGS) - the horizontal and/or vertical dimensional size of the vision...
Yes, stainless steel doors and frames are available. Door Construction: LS-Series: Visible edge seams Door construction similar to the ...
The following items are needed for Spec Writers to write a door and hardware specification  Building code being used Occupancy type or types Occupancy load for any rooms or areas of ass...
Von Duprin offers two options:   The CDSI/HDSI Dogging Indicator provides an at-a-glance verification of the status of the door from inside of the room. Visible “LOCKED” and “UNLO...
The (SF) "Swing Free" arm allows the door to be put into hold open position, but then repositioned (swing free) to any other degree of opening without taking the closer out of the hold open mode....