what does fp stand for on lcn closer

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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...
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....
The 1040 and 1050 are obsolete closers made in the 50's, 60's, and 70's. The 1260 or 1460 will work as replacements, but they are not direct replacement.
Neither Dor-O-Matic or LCN manufacturers a floor closer. 
The 1521 is simply a re-numbered 4031 closer. They are the same unit.
The 4040XP, 1260/1261, 1460/1461, 4030/4031 closers have the tri-pack mounting option when ordered with an Rw/PA or Hw/PA designation.
It would be unnecessary to use the CNS/Cush arm and the Glynn Johnson overhead devices in the same application, both mechanisms stop the door.