boxed mullion
boxed mullion
A hollow mullion which houses sash counterweights in a window frame; built up from boards so as to provide a solid appearance.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive
Supported by coloured tubular steel bowstrings with welded junctions,
boxed mullions and transoms subdivide the main bays into threes.
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