A properly working smoke alarm has been confirmed to increase your chance of survival within a fire by over 50%.
Smoke detectors have been required in new residential an multifamily housing since the early 70's and considering they use a rated expected life of 8 to 10 years it might be time for you to replace them. You should not install this technique in unfinished attic since fluctuations of the temperature as well as the dust will make the system be employed in inappropriate performance.
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