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A rectangle housing fans, filters and coils.
Also known as: AHU plan symbol, Air conditioning unit symbol
On a building services plan an air handling unit is drawn as a rectangle containing marks for its fans, filters and coils, conditioning air before it is distributed.
Denotes the plant conditioning air before it is distributed through ductwork.
Contexts: Technical drawing
Is drawn with internal divisions because the order of its sections matters: a coil placed before a filter fouls, and one placed after does not.
Contexts: Technical drawing
A large rectangle divided into sections by internal lines, with duct connections at each end.
A fuller structured visual breakdown is not yet documented for this symbol.