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ipx4 is fine (some wholesalers have higher rated fans from eastern block ****ries from time to time, I dont think they are higher rated in reality) yes double insulated means no bonding

As its in a shower its going to be suseptable to moisture and steam so get the highest ip rating you can. Its a fixed appliance and if its ip rated for4 the job won't need an rcd. you can fit one for piece of mind if you wish its up to you you don't need to bond extractor fans of this nature...