A Mullion is a vertical frame member set in a double door opening which will allow both door leaves to be active.
Mullions can be fixed or removable.
Mullions may also occur between a door and a sidelight or as a vertical and/ or horizontal member separating lights or panels
Hardware Mullion: Supplied by the Hardware Manufacturer and are always removable:
Installed during door hardware installation
Always removable
Most commonly used in double door Rim Exit Device applications.
Keyed Removable Steel Mullions makes removal faster and easier by a single operation of the mortise cylinder.
Hollow Metal Mullion: Supplied by the Hollow Metal Manufacturer and allow for the use of all locks including cylindrical locks, mortise locks and mortise lock exit devices.
These mullions are fabricated as closed sections with a profile to match the hollow metal frame and located between the each leaf or double doors.
Can be either fixed or removable
Fixed Mullions - Welded to the frame head. During installation, anchored to the floor at the base of the mullion.
Removable Mullions - Mechanically attached (during installation) to the underside of the frame head and to the floor.
Specified and used in applications requiring periodic movement of large furniture and equipment.
Hollow Metal mullion may also occur between a door and a sidelight or as a vertical and/or horizontal member separating lights or panels.
Steelcraft "standard depth " mullions include a #16 gage internal reinforcement. "Special depth" mullions do not include this internal reinforcement.
DISCLAIMER:
INFORMATION PROVIDED THROUGH THIS SITE IS PROVIDED TO YOU AS IS WITHOUT ANY EXPRESS REPRESENTATIONS OR WARRANTIES
OF ANY KIND, AND WE MAKE NO REPRESENTATION OR WARRANTY THAT THIS SITE(OR ANY INFORMATION PROVIDED IN RESPONSE TO
YOUR INQUIRY), WILL BE ACCURATE, COMPLETE, OR ERROR-FREE.
YOU AGREE THAT YOU MUST EVALUATE ALL INFORMATION AND RESPONSES, AND THAT YOU BEAR ALL RISKS ASSOCIATED WITH, THE
USE OF THIS SITE, INCLUDING ANY RELIANCE ON THE ACCURACY,COMPLETENESS, OR USEFULNESS OF ANY INFORMATION OR MATERIALS
MADE AVAILABLE THROUGH THIS SITE.