the upright or vertical member dividing the panels in a door; the vertical member of a sash, window or door frame between openings in a multiple-opening frame; the mullion is known as the “mullion center”; frames are termed “mullions”, “triples”, or “quadruples”, depending on whether they have one, two or three mullions respectively; in doors, sometimes “muntings.”
Millwork Definitions
MULLION
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