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Here are the spots you should always place a smoke detector: ... Replace smoke detectors at least every 10 years: ... For sealed-battery units, the battery is often only rated for 10 years.
Typically, you should have at least one carbon monoxide detector on every level of the home, including the basement and attic, though the size of the home and the number of gas burning appliances ...
The alarm points on carbon monoxide detectors are not a simple alarm level (as in smoke detectors) but are a concentration-time function. At lower concentrations, e.g. 100 parts per million (PPM), the detector does not sound an alarm for many tens of minutes. At 400 PPM, the alarm sounds within a few minutes.
The rechargeable batteries were often replaced by a pair of AA batteries along with a plastic shell encasing the detector. The photoelectric (optical) smoke detector was invented by Donald Steele and Robert Emmark from Electro Signal Lab and patented in 1972. [15] In 1995, the 10-year-lithium-battery-powered smoke alarm was introduced. [10]
Zinc–carbon batteries have a lower per unit cost and are often used as power for appliances that consume little energy, like remote controls for television, clocks, and smoke detectors. Zinc-carbon batteries were in common use with hand-cranked telephone magneto phones, powering the microphone and speaker.
Less than a week after a carbon monoxide leak sickened 39 at an elementary school, a new bill has been introduced to require detectors in all schools
The use of carbon monoxide detectors has been standardized in many areas. In the US, NFPA 720–2009, [99] the carbon monoxide detector guidelines published by the National Fire Protection Association, mandates the placement of carbon monoxide detectors/alarms on every level of the residence, including the basement, in addition to outside ...
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