What maintenance do smoke detectors require?

Test the detector at least monthly by pushing the test button. Once a year vacuum the dust from alarm air vents. Battery operated detectors should have the battery replaced each year or when the low battery warning sounds. Select a memorable date such as a holiday or a family birthday to remind you to replace the batteries in your smoke detectors at that time.

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1. How much does a smoke detector cost?
2. What kind of smoke detector should I buy?
3. How many smoke detectors do I need?
4. Where should I place a detector?
5. How do I install a smoke detector?
6. What maintenance do smoke detectors require?
7. Is there anything else I should do with my smoke detector?