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Gentex smoke detector 9123F replaced by the Gentex S1209F. Also I am back to posting on Fire Alarms. - YouTube
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Gentex smoke detector 9123F replaced by the Gentex S1209F. Also I am back to posting on Fire Alarms. - YouTube
![Gentex smoke detector 9123F replaced by the Gentex S1209F. Also I am back to posting on Fire Alarms. - YouTube Gentex smoke detector 9123F replaced by the Gentex S1209F. Also I am back to posting on Fire Alarms. - YouTube](https://i.ytimg.com/vi/qjaxNJYOhlc/sddefault.jpg)
Gentex smoke detector 9123F replaced by the Gentex S1209F. Also I am back to posting on Fire Alarms. - YouTube
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