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What is a mullion is?

Updated: 10/5/2023
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15y ago

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It's a set of boards between two (or more) windows that are joined together in a group.
It's just trim, it's non-structural in that doesn't support anything above it, it just ties the windows together in the opening.

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15y ago
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12y ago

Mullions are the grill devices that are normally inserted between two panes of glass which give a window a divided pane look.

Mullions are commonly confused in the industry for what is known as a Mull-bar and is a vertical metal or vinyl h-shapped device that is used to join two large framed windows side by side to give support so the units do not sway under wind load.

Mr. B

(20 Yr Retail Home Improvement Expert HD )

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12y ago

a mullion is a type of grille or frame the goes over a window to create the look of being a multi-paned window

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