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A duct fitting closing where a duct crosses a barrier.
Also known as: Fire damper plan symbol, Duct fire barrier symbol
On a building services plan a fire damper is drawn at the point where ductwork crosses a fire-resisting construction, closing to maintain that barrier.
Denotes a damper that closes to maintain the integrity of a fire-resisting construction where ductwork passes through it.
Contexts: Technical drawing
Is drawn at the barrier rather than anywhere convenient, because its position relative to the construction is the whole of its function.
Contexts: Technical drawing
A short marked section of duct drawn at the wall or floor line, with a diagonal or a hatched block across it.
A fuller structured visual breakdown is not yet documented for this symbol.