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A ribbed double line.
Also known as: Flexible duct symbol, Flex duct plan symbol, Ribbed duct symbol
The services drawing symbol for flexible ductwork, drawn with a ribbed or coiled line to distinguish it from rigid duct.
Marks flexible ductwork on a services drawing.
Contexts: Technical drawing
Is distinguished from the rectangular duct symbol the catalogue already holds by line texture rather than by line style, so the convention works at any drawn duct width.
Contexts: Technical drawing
A double line drawn with regular ribs or a coiled edge along its length, distinguishing it from the plain lines of rigid duct.