LCN DOUBLE EGRESS

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An LCN 4040T with a reveal deeper than 1/8" on the pull side of the opening requires a Double Egress (DE)arm. ST3073 Standard 4040T DE Arm will accommodate reveals up to 2-11/16"....
Double Egress Opening: A pair of swinging doors, each leaf which swings in the opposite direction of the other. DOORS: A pair of doors swinging in opposite directions without a vertical mullion....
There is no mullion for double egress openings.  Mullions only applies to the doors that open in the same direction.
The overhead concealed operators (2850/2860) will not work on a Double Egress frame because the doors are not in the same plane. You will have to use the surface mount (9553 / 9563) on Double Egres...
The 4040SE uses the regular arm for any Push Side mounting (minimum 28" door width). ST-2788 (a special arm and track) can be used to mount a 4040SE on the Push Side of a smaller (narrow) door. Sm...