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The lady's house I went to had the cathedral ceiling in her bedroom, the hard-wired 120 volt smoke alarm was next to a ceiling fan. When I blew out the alarm module, dust really came out of it, all the rest showed no dust at all. The dusty one was the one that alarmed.
About 100 times the normal airflow circulated around that alarm because of the fan. They were about 3 years old.
Out Montanas have the 9volt alarms, but they need to be cleaned as well.
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