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Related to channel section: box section
1. A structural or rolled steel shape used in steel construction.
2. A decorative groove, in carpentry or masonry.
3. An enclosure containing the ballast, starter, lamp holders, and wiring for a fluorescent lamp, or a similar enclosure on which filament lamps (usually tubular) are mounted.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.