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A duct fitting adjusting the air passing through.
Also known as: Balancing damper symbol, VCD plan symbol
On a building services plan a volume control damper is drawn as a marked section of duct containing an adjustable blade, balancing the air delivered to each branch.
Denotes an adjustable damper setting the volume of air passing along a branch.
Contexts: Technical drawing
Exists because ductwork delivers air to whichever branch offers least resistance, and without balancing the nearest terminal takes most of the flow.
Contexts: Technical drawing
A short section of duct crossed by a single diagonal line with a small adjustment mark at one end.
A fuller structured visual breakdown is not yet documented for this symbol.