Inspection: Each Mezuzah must be examined by a reliable scribe, at least twice every seven years. Temperature and weather changes, as well as age, may cause the ink to fade and crack, thereby invalidating the Mezuzah.

Before affixing a Mezuzah to a doorpost, the following blessing should be recited:

Hebrew Transliteration: Boruch Atah A-do-nai Elo-heinu Melech Ha-olam asher kidishanu b'miyzvotov v'tzivanu likboa Mezuzah.

Translation: Blessed are You, L-rd our G-d, King of the universe, who has sanctified us with His commandments and commanded us to affix a Mezuzah.

If more than one Mezuzah is being affixed at one time, only one blessing is recited. When affixing a Mezuzah to an archway, no blessing is recited.

The Mezuzah is affixed:

1. On the right doorpost as one enters.
2. In a slanted position with top pointed to inside of room.
3. In the upper third of doorpost height (shoulder high).
4. On outer 3.2 inches of doorpost width.