Where is a mezuzah not placed?
In bathrooms or restrooms
Source: Shulchan Aruch YD 286
In detail
Mezuzot are NOT placed on bathrooms, restrooms, or shower rooms because these spaces are not fitting for sacred text. Small storage closets are also exempt. Some authorities also exempt open porches and temporary structures (like a sukkah outside of Sukkot).
Full study guide: Daily Mitzvot
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