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“ what is an auxiliary latch ”

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Answer
Does Von Duprin have a fire latch that will go into the floor?
Auxiliary fire latch is tested only from door to door latching by Von Duprin. Some door manufacturers have tested our devices LBR and use additional fire latches to pass the fire test. Contact the ...
At what degree will the AFL (Auxiliary Fire Latch) bolt release?
1400 degrees which is approximately 20 minutes after the fire starts.
AUXILIARY FIRE LATCH
AFL
Where do I install my Auxiliary Fire Latch (AFL) in a Less Bottom Rod, Fire Rated (LBR-F) exit device?
Installation should be 6" from bottom of the door. See attached templates as reference.  T-5494 for HM Doors W-5494 for Wood Doors
AUXILIARY DEAD LATCH
Deadlocking Latch Bolt
What is a lock function?
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...