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  2. The Best Place to Put Your Smoke Detector (Plus 3 Spots ... - AOL

    www.aol.com/lifestyle/best-place-put-smoke...

    Replace smoke detectors at least every 10 years: ... For the most part, you can plan on replacing your smoke detector at least every 10 years. For sealed-battery units, the battery is often only ...

  3. Smoke detector - Wikipedia

    en.wikipedia.org/wiki/Smoke_detector

    Smoke detector mounted on a ceiling. A smoke detector is a device that senses smoke, typically as an indicator of fire.Smoke detectors/alarms are usually housed in plastic enclosures, typically shaped like a disk about 125 millimetres (5 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary.

  4. Americium-241 - Wikipedia

    en.wikipedia.org/wiki/Americium-241

    With its half-life of 432.2 years, the americium in a smoke detector decreases and includes about 3% neptunium after 19 years, and about 5% after 32 years. The amount of americium in a typical new smoke detector is 0.29 micrograms (4.5 × 10 −6 grains) (about 1/3000 the weight of a small grain of sand) with an activity of 1 microcurie (37 kBq ...

  5. Fire alarm system - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_system

    Coded fire alarm pull station below a 10-inch (25 cm) bell. Magnetic smoke door holders and retainers are wall-mounted solenoids or electromagnets controlled by a fire alarm system or detection component that magnetically secures spring-loaded self-closing smoke-tight doors in the open position.

  6. First Alert - Wikipedia

    en.wikipedia.org/wiki/First_Alert

    On September 4, 1992, BRK recalled all hardwired smoke alarms under the series 1839I and 2839I due to testing programs determining that corrosion could form on the alarm horn's electrical contacts, causing the piezo to fail to make any noise. [6] In May 2006, First Alert combination smoke alarms were recalled due to draining batteries rapidly. [7]

  7. Kidde - Wikipedia

    en.wikipedia.org/wiki/Kidde

    Kidde (/ ˈ k ɪ d ə / [2]) is an American multinational company that manufactures and distributes fire detection and suppression equipment, as well as smoke and CO alarm units. Kidde is one of America's largest manufacturers of smoke alarms [3] [4] and fire safety products. [5]

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