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by dehrmann 2280 days ago
https://www.cpsc.gov/s3fs-public/WPI2015SmokeAlarmReport.pdf

> photoelectric smoke alarms should not be placed near bathrooms or similar locations that create steam. Even though location recommendations are already common on alarm packaging, nuisance alarms persist in homes due to inappropriate alarm placement

Which I suppose is on me, but it is a known issue with some smoke detectors.