What is a Mullion?

A mullion is a vertical or horizontal element that divides a window or door into smaller sections or panes. It is a structural or decorative element that provides support and divides the glass area into multiple smaller openings. Mullions can be made of various materials such as wood, metal, or vinyl, and are often designed to match the style and aesthetics of the window or door.

In traditional architecture, mullions were commonly used in windows to support the glass and provide structural integrity. They were often made of wood and divided the window into individual panes of glass. Over time, mullions also became decorative elements, featuring intricate designs and patterns.

In modern architecture, mullions are still used in windows and doors, but they may also be found in other applications such as cabinet doors or room dividers. Mullions can enhance the visual appeal of a structure and provide architectural interest by creating a grid-like pattern or dividing a large opening into smaller sections.