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Mullion
A mullion is the vertical brace that frames and divides the panes of glass in a window. It should not be confused with the muntins, which are the smaller wood trim pieces that run horizontally and vertically in a decorative grid.
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Easy to see in this photo, the mullions are the white painted wood running vertically between the three panes of glass.
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These contemporary windows have metal mullions, but mullions are commonly made of wood and stone as well.
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In the case of these industrial-style windows, the mullions are made of wood but the muntins are made of metal.
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Here the vertical mullions blend with the muntins and trim, floor and ceiling, but just look for the thickest vertical window brace that isn't framing the door.
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A mullion is stationary, but the window itself, or any applied grid of muntins, is usually able to move.
Easy to see in this photo, the mullions are the white painted wood running vertically between the three panes of glass.
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