Mullions are used on a pair of doors to add security.

Fixed mullions become a part of the frame between two doors.  This type of mullion will actually separate the doors which causes the doors to become individual doors within the frame.  Selecting a fixed mullion will either increase the rough opening width or reduce the door width sizes. As by the name, once in place they can not be removed.

Removable mullions are a piece of hardware that is only used at a pair of doors in which the doors stop against the mullion and the mullion effectively seals the gap between them. The mullion can be removed with a keyed cylinder can be installed so that a cut key is required.

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