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A square with inward lines drawing air back.
Also known as: Extract grille symbol, Return air terminal symbol
On a building services plan a return grille is drawn with lines directed inward, taking air out of the room and back to the plant.
Denotes a terminal drawing air out of a space and back towards the plant.
Contexts: Technical drawing
Completes the pair with the supply diffuser: a room needs both, and a space with only supply pressurises against its neighbours.
Contexts: Technical drawing
A square with lines running inward from its edges towards the centre, or a rectangle with parallel bars.
A fuller structured visual breakdown is not yet documented for this symbol.