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  The answers to these questions will help determine if it is. Smoke Detectors: There are three basic types of residential smoke detectors, all with different means for detecting smoke and fire, different types of fires they detect best, and different replacement reasons & needs. Ionization Smoke Detectors powered by batteries are the most common kind and economically available at most local hardware and discount stores. They can be mounted easily in just about any location. They use a small radioactive source (not harmful to humans) to cause the air inside the detector to be capable of carrying electric current. As particles of smoke enter the detector they block the flow of electricity. Low electrical current causes the alarm to sound. These detectors work best on flaming type fires (wood, paper, etc) and react a little slower on smoldering fires (mattresses, couches, etc). Batteries need to be replaced occasionally. If your detector starts making a chirping sound every so often, you need to change the battery. A general recommendation is to change these batteries every six months, usually timed to a major event like springing forward to daylight savings time or falling back to normal time. (Some newer smoke detectors come with a 10 year Lithium battery that eliminates the need to change batteries.) Remember battery powered detectors operate even during power failures. Photoelectric Smoke Detectors use a light sensitive photocell to detect smoke inside the detector. They usually require a connection to an electrical supply but are also available with a battery backup. A light bulb puts out a beam of light. The photocell is hidden from direct exposure to the light beam. Smoke entering the detector causes the light beam to be reflected in several directions. The photo cell detects the reflected light and causes the alarm to go off. These detectors work best on smoldering fires and react a little slower on flaming type fires. The light bulbs need replacement every few years. Thermal Detectors usually requiring a connection to an electrical supply, react to heat rather than smoke. A fire must raise the heat level near the detector to cause the alarm to go off. This type of detector is mostly used in dusty, dirty environments usually found in industrial and commercial applications. This is the type of detector that most fire sprinkler heads use to detect heat, pop, and start spraying water. This detector would be good near a cooking stove where an ionization or photoelectric smoke detector might cause false alarms. Where Should You Put Smoke Detectors? Why should you replace your smoke detectors every 10 years? The NFPA recommends, and some cities Fire Codes require, that smoke detectors be tested at least monthly and replaced when they fail to respond or every 10 years maximum. In addition, most manufacturers now mark their detectors for a maximum life of 10 years. Why do they need to be replaced every 10 years? 10 years is a somewhat arbitrary figure, developed by the Consumer Product Safety Commission (CPSC) but, as with any equipment you buy (TVs, VCRs, etc), parts start breaking and failing as the equipment ages. This includes smoke detectors. Sometimes stuff just breaks without us noticing (in the case of smoke detectors, it’s sometimes to late). The detection chamber gets clogged with dust & other airborne debris. In addition, as detectors age the sensitivity settings tend to drift toward being more sensitive causing more false alarms and people tend to disconnect the power supply on those detectors. A 1994 CPSC study found that sixty percent of detector failures were caused by the power supply (electricity or batteries) intentionally being removed due to problems with false alarms. Fifty percent of the failed detectors were more than 10 years old. The fact that some older detectors were made to be more sensitive also resulted in their disconnection from power. Always replace your detectors whenever any of the following occur. When you move into a used home, you have no way of knowing how old the detectors are. Replace them when you move in. Carbon Monoxide (CO) Detectors Carbon Monoxide kills silently and sneakily. It is a colorless, odorless gas that is a byproduct of fossil fuel burning. It can be generated by wood stoves, fireplaces, appliances that use natural gas, propane or oil such as furnaces, space heaters, dryers, kitchen ranges, or other open flame appliances. Normally the gases generated by burning are vented safely outside the house, however blocked vents or not enough oxygen to the burners can quickly cause elevated levels of CO. The best defense is a good offense.
CO is sneaky. CO hurts you by rapidly accumulating in the blood stream which depletes the bloods ability to carry oxygen throughout the body. Even at low levels, carbon monoxide can cause serious health problems. Some of the symptoms of CO poisoning are similar to those of the flu, i.e. headaches, nausea, fatigue, dizzy spells, etc. If you may have been exposed to CO and feel like the flu bug bit you, you should also ask your doctor to check you for CO poisoning. Battery powered and electrically connected CO detectors are available that can detect CO at levels as low as .01 percent. Follow the manufacturer’s recommendations in placing & testing CO detectors. They are generally placed near sleeping areas and the home’s furnace. Most manufacturers recommend testing CO Detectors weekly and replacing them every five years. Just like smoke detectors, they wear out and fail. How Should You Respond to a CO Alarm?
If you need a CO Detector and you have it, you’ll be glad you had it. If you need a CO Detector and don’t have it, you may never know the difference, but your relatives will! Fire Extinguishers Neither one extinguisher nor one type of extinguisher is adequate to protect your home. In a three bedroom home with a basement and a garage, I recommend that you have at least four extinguishers. Only try to fight minor blazes. If it becomes a serious fire, GET OUT! Call 911 from a neighbor’s house. Your Fire Escape Plan This information is my opinion based on my research and education. It is provided for general information purposes only. Any actions you take based on this information is your responsibility. I suggest that you consult a specialist in the particular field to determine the best practices in your particular situation.  
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