ATEX and IECEx use the ‘zones’ system, where zone 1 is a fairly dangerous area, for gas environments.
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ATEX Zone 0IECExClass I, Div I
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ATEX Zone 1IECExClass I, Div I
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ATEX Zone 1/21IECExClass I, Div I
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ATEX Zone 1
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ATEX Zone 1/21IECExClass I, Div I
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ATEX Zone 1/21IECExClass I, Div I
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ATEX Zone 1/21IECExClass I, Div II
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ATEX Zone 1/21IECEx
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ATEX Zone 1
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ATEX Zone 1/21IECExClass I, Div I
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ATEX Zone 1/21IECExClass I, Div I
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ATEX Zone 1/21IECExClass I, Div I
