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.
A labelled flap in a duct.
Also known as: Damper marking, Ventilation damper sign
The IMO marking identifying a damper that closes a ventilation duct to stop fire and smoke spreading.
Identifies a fire damper and the space whose ventilation it controls.
Contexts: Public information, Navigation
Ventilation is how a ship fire spreads fastest, so the dampers are closed early in a fire plan and each must be identifiable without tracing the duct it sits in.
Contexts: Public information, Navigation
A small plate carrying a duct symbol with a hinged flap across it, marked with the space it serves and its open and shut positions.