We'd like to use analytics cookies to understand which symbols people look up, so we know what to research next. They are not used for advertising and we set none of them unless you say yes. What we store.
Two parallel lines carrying air, sized on the drawing.
Also known as: Ductwork plan symbol, Air duct symbol
On a building services plan rectangular ductwork is drawn as two parallel lines annotated with its cross-sectional dimensions.
Denotes rectangular ductwork, its size given by annotation rather than by the width drawn.
Contexts: Technical drawing
Is drawn to scale in plan but annotated for depth, since a plan cannot show the second dimension of a duct.
Contexts: Technical drawing
Two long parallel lines representing the duct sides, with a figure written along them giving width and depth.
A fuller structured visual breakdown is not yet documented for this symbol.