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A circle with blades removing air from a room.
Also known as: Extractor fan symbol, Exhaust fan plan symbol
On a building services plan an extract fan is drawn as a circle with blade marks, removing moist or stale air from a room directly to outside.
Denotes a fan removing air from a space directly to outside.
Contexts: Technical drawing
Requires replacement air to enter the room from somewhere, which is why an extract fan on a plan implies a ventilation path that the symbol does not show.
Contexts: Technical drawing
A circle containing two or three curved blade shapes, drawn at a wall or ceiling position.
A fuller structured visual breakdown is not yet documented for this symbol.