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On the ETH2313 horn, is it a requirment to use it with a EAJC26 outlet box, or can I use it with any explosionproof rated junction box?

Our instruction sheets suggest using our GUAC26 junction box for Class 1, Division 1 and 2, groups C and D areas, however if using in a group B area, use our EAJC26 outlet box with the ETH2313 horn