removeable mullion on double egress frame?

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Fire Rated three (3) frames are available in the following maximum door opening sizes: F and FN-Series frame: 4' 0" X 10' 0" single door opening 8' 0" X 10' 0” double door opening MU-Ser...
There is no mullion for double egress openings.  Mullions only applies to the doors that open in the same direction.
Contra-swing mullion; Opposite Swing Mullion
No. Fire rated double egress frames must be a stand alone 3 sided frame assembly. If transom lights and/or sidelights are required, they must be built and installed as separate Fire Window assemb...
A Double Egress frame is a double door frame prepared to receive two single-acting doors swinging in opposite directions (both doors are) the same hand. These openings are installed in cross corrid...
Yes, wood doors can be used and installed in most hollow metal frame applications including FE-Series and DE-Series Double Egress frames. Caution - For fire rated applications the wood door manufa...
FE-Series, DE-Series; two way corridor openings
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...
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...