When you want to join one or more windows together, a fitting piece or mullion is used to attach them. In this way two or three double hung or casement windows can be joined together to make spectacular window walls. A fixed lite or transom can be joined by a mullion to the top of another window style to add window height in rooms with high ceilings.
A narrow wood component which forms the division between two separate wood or lite components. Usually has profiled edges to match the moulding. Most common example is a "french" door design (Madawaska design #5205).
An intermediate connecting member used to "marry" two or more windows or patio doors together in a single rough opening without sacrificing air or watertight performance. A mullion also can give added strength to the connection for structural stability.
A verticle bar separating panes of window glass. Mullions are typically spaced four to five feet apart, but can be any width. Office walls are usually aligned with the window mullions. Mullion spacing can influence the amount of office space you require since the width of the office is dictated by the mullion spacing. Four foot mullion spacing results in offices that are 8,12,or 16 feet wide, Five foot mullions result in 10,15 or 20 foot wide offices, etc.
glass doors with pieces of wood separating 9 spaces are separated with mullion. The glass doesn't come with it. You would have to supply your own glass. The mullion is completely aesthetic. The only fully glass doors are in the Monterey series - using an opaque penhead glass. They have two side pieces, in the color of the Monterey, called styles. If you would want to order a glass door without mullion, open frame (OF) it is not available in the San Juan, only in wood doors (blue and green titles).
An accessory extrusion that is used to join two or more windows side by side above or below, mullions are designed of several types; "snap" - provides a rigid connection, "slip" provides an expansion capable connection, "structural" - provides a connection that will withstand very high wind loads.
A mullion is a structural element which divides adjacent window units. Mullions may be made of any material, but wood and aluminum are most common, although stone is also used between windows. Mullions are vertical elements and are often confused with transoms, which lie horizontally.