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Versions of Generic mine ventilation duct spool, 48 in diameter

Published versions never change. A new license, new data or new geometry is always a new version; people who used an older one keep it.

Drawing	Version	Change	License	Status	Published
	Version 2	GeometryAdded the round duct spool with flanges at both ends, a middle stiffening band and two hanger straps with rods to a ceiling bar (plan and 3D).	CC0	Published	Nov 3, 2026
	Version 1	GeometryFirst version.	CC0	Published	Nov 3, 2026