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A self-contained residential smoke alarm lasts about 12 years, but must be replaced no later than 10 years for safety. Some units now have a 10-year battery life or other features that cannot be extended, thus requiring it to be discarded and replaced at 10 years.
Usually around 10 years, but you must test your alarm regularly because different quality smoke detectors last for different amounts of time.
It's recommended that a smoke detector alarm be replaced every 8-10 years. It is also helpful to write the date of purchase on your smoke detector alarm for future reference.
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Has the four wheeler invention saved lives?
Yes, this futuristic invention they call a "four wheeler" has saved many lives.
How many type of smoke detectors?
There are basically two types of smoke detector; one type measures the opacity of the air to literally "see" if there is smoke. The other type tests for ionization that occurs when there is a fire. That type smoke detector uses a small radioactive chip to determine if freshly ionized smoke is present. It's a far more accurate means of determining the presence of fire and associated hazardous smoke. Many smoke detectors use a combination of both detectors. A separate type of detector is the carbon monoxide detector, which senses the presence of harmful carbon monoxide in the air. Most will even indicate the percentage of carbon monoxide. Note that carbon monoxide is typically present when a furnace or other heating device malfunctions.
How many lives have been saved by a AED?
5 billion
Did pencillin help war?
Yes it saved many lives
Many smoke detectors contain?
a. Americium-241 Smoke detectors might have an ionizing chamber. If it does, the chamber holds a radioactive nuclide to ionize the particles in the smoke to set off the detector. Usually the radioactive source is americium.
How many lives did jack Simpson saved in gallipoli?
3000 men
How many lives were saved during 911?
1zillion trillion billion
How many lives have been saved by the blood bank?
3 lives for every 1 pint of blood
How many lives were saved by bullet proof vests?
Many, but no-one kept count.
A man who saved the lives of many men women and children?
Oskar Schindler
How many lives saved on motorcycles by wearing a helmet?
Countless, there is no possible way to put a number on the lives saved by riders wearing helmets. There has been no research or tally to ever determine a number of lives saved and I'm sure the number increases daily as more and more accidents occur.
What is smoke density?
measures how many (usually) parts per million (ppm) of whatever smoke/gas/etc is being looked for. For instance a smoke detector looks for X ppm of smoke in air, or a CO2 sensor measures the ppm of CO2 in air - ppm is a measure of density.
