Carbon monoxide kills because it inhibits the ability of the body to use oxygen.
Death can result without the person ever noticing any prior symptoms. If carbon monoxide poisoning is suspected or if a CO detector sounds an alarm, immediately open windows and doors for ventilation. If anyone is experiencing any of the above symptoms, call the fire department and request medical assistance. If no one is experiencing any symptoms, turn off the fuel-burning appliance or device and continue to ventilate. Do not operate again until the source of the problem has been identified.