English translation: in series/group of separatos/dividers/sorters
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Explanation: Talking about where to place the extinguishers... the "separator group" may be some kind of enclosure containing such separators. If this is the case you would place them "on" the housing or "near" it.
If the separators are located inside a room then I would say: "in the separator room".
Hope it helps.
Jackie_A United States Local time: 21:22 Native speaker of: Spanish, English