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Question:

why do batteries in smoke detectors have to be replaced in 6 months?

why do batteries in smoke detectors have to be replaced in 6 months?

Answer:

There is no NATIONAL fire code on this subject. However, your local Fire Marshall can answer these type of questions. Here the apartment complex's building manager is responsible for having fire extinguisher placed all over the complex, but each individual apartment must provided their own.
double check the fuses, if they all are good. you might have some lose wires

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