Eruv Chatzeros Instructions
The eruv should consist of one grogeres (around 0.65 oz.) of matzah for each dwelling benefiting from the eruv. However, eighteen grogros (around 11.7 oz.) suffices for any amount of dwellings, even if the number exceeds eighteen. A pound of matzah is thus sufficient in every case. The matzos used should be complete.
The one making the eruv takes the matzah and gives it to another adult male, to acquire it on behalf of all those benefiting from the eruv. This is done by lifting the matzah one tefach (around 3 in.), after which he returns it to the one making the eruv.
The one making the eruv should state that the eruv includes all those presently living in the domains affected by the eruv, as well as all those who may join throughout the year. The one making the eruv recites the berachah of Al Mitzvas Eruv, followed by Bedein yehei shara lana, as printed in the siddur. If he does not understand Aramaic, he should say it in a language he understands.
The matzah should be kept in a secure spot, specifically in a place designated for dwelling purposes (not a porch, garage, or the like), for the duration of the year. It should not be eaten during that time.
