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If you use fuel-burning appliances--a gas or oil furnace, a gas stove, a kerosene heater, or a wood-burning stove or fireplace--your home should have a carbon monoxide (CO) alarm. Furnaces or appliances that aren't working correctly or that aren't vented properly can leak this colorless, odorless gas into your home. Low levels of CO poisoning can cause flu like symptoms; higher levels can cause unconsciousness, brain damage, and death.
We tested two plug-in alarms and found that they responded to elevated CO levels. The First Alert CO Alarm FCD4, $48, and the Kidde Nighthawk CO Alarm, model KN-COPP-3, $50, displayed digital readouts of CO levels that were within 10 percent of the actual levels we used. They also quickly reset when exposed to fresh air, and they have a button that temporarily ...