A mullion is a vertical structural element that divides adjacent window or door units, providing both support and aesthetic appeal. Mullions can be made from various materials, including wood, metal, or stone, and can be found in different architectural styles such as Gothic, Romanesque, and modern designs. In addition to their structural function, mullions add visual interest and can enhance a building’s facade or interior.
Related terminology:
Window frame
Sash
Transom
Glazing
Fenestration
Casement window
Double-hung window
Curtain wall
Architectural styles
Building façade
References:
Architectural Digest: Mullion – Definition and Use in Architecture
The Spruce: Understanding Mullions and Their Role in Windows and Doors
National Association of Realtors: Architectural Elements and Real Estate Appeal
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