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Areas not classified as zone 21 in which combustible dust clouds may occur infrequently, and persist for only a short period, or in which accumulations or layers of combustible dust may be present under abnormal conditions and give rise to combustible mixtures of dust in air. Where, following an abnormal condition, the removal of dust accumulations or layers cannot be assured, then the area is to be classified zone 21. This zone can include, among others, areas in the vicinity of equipment containing dust, where dust can escape from leaks and form deposits (such as milling rooms in which dust can escape from the mills and then settle) IEC 61241-3, definition 2.13].