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MB4 237a: Guests and Their Obligation Towards an Eruv (370:6-8)
A servant or a student doesn't need to participate in the eruv if they receive their food from the owner or school.
A guest or a renter who is there for less than 30 days doesn't invalidate an eruv chatzerot if he doesn't participate.
Do guests without the owner present need to make their own eruv?