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A square with radiating lines delivering air.
Also known as: Ceiling diffuser symbol, Supply grille symbol
On a building services plan a supply diffuser is drawn as a square or circle with lines radiating outward, delivering conditioned air into the room.
Denotes a terminal delivering supply air into a space.
Contexts: Technical drawing
Radiates its lines outward where a return grille draws them inward, so the direction of air flow is readable from the symbol itself.
Contexts: Technical drawing
A square with diagonal lines running from its centre outward to its corners, or a circle with radiating lines.
A fuller structured visual breakdown is not yet documented for this symbol.