Oriel Window, Muntin and Mullion Definition Page

Oriel Window

An oriel window is a window that projects out from a building. It does not reach to the ground, so it is cantilevered from the building. Often oriel windows are single windows, but they can be a bank of windows, as with a bay window. In the example below a multi-storied set of oriel windows projects out from the Glasgow School of Arts, designed by Charles Rennie MacIntosh.

Glasgow School of Arts Oriel Windows

Muntin and Mullion

Mullion and Muntin Example

These two terms are often confused. They are related. The muntin is the divider between individual panes of glass. A mullion is a divider between windows. In modern windows the muntin is usually between the two panes of a double insulated glass or rests on one side or the other, merely suggesting that the large glass pane is actually many separate panes.

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