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A serpentine line across a duct.
Also known as: Heater battery symbol, Duct heater symbol
The services drawing symbol for a heating coil within an air handling unit or duct.
Marks a heating coil within an air handling unit or duct.
Contexts: Technical drawing
Draws a serpentine path because the coil is a pipe folded back on itself, so the symbol is a plan of the actual component rather than an abstraction of it.
Contexts: Technical drawing
A line running back and forth in tight folds across the width of the duct, drawn between the duct's two lines.