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A hatched band across a duct.
Also known as: Air filter symbol, Filter bank symbol
The services drawing symbol for an air filter within a duct or air handling unit.
Marks an air filter within a duct or air handling unit.
Contexts: Technical drawing
Is drawn square to the duct where a damper is drawn on a slant, so the two are told apart by angle alone: a filter does not move and a damper does.
Contexts: Technical drawing
A band drawn across the duct filled with diagonal hatching, its edges square to the duct walls.