The great danger of carbon monoxide is its attraction to hemoglobin in the blood stream. CO is breathed in through the lungs and bonds with hemoglobin in the blood. Displacing the oxygen cells need to function. Carboxyhemoglobin causes symptoms similar to the flu, such as headaches, fatigue, nausea, dizzy spells, confusion and irritability. As levels of COHb increase, vomiting, loss of consciousness and eventually brain damage or death can result.
Carbon monoxide is a by-product of combustion, present whenever fuel is burned.
It is produced by common home appliances, such as gas or oil furnaces, refrigerators or clothes dryers, water heaters, fireplaces, charcoal grills, gas ranges, wood burning stoves and space heaters. Fumes from automobiles also contain carbon monoxide and can enter the home through walls or doorways if a car is left running in an attached garage. All of these sources can contribute to a CO problem in the home. If a home is vented properly and is free from appliance malfunctions, air pressure fluctuations or airway blockages, carbon monoxide will most likely be safely vented to the outside. Furnace heater exchangers can crack, vents can become blocked, inadequate air supply for combustion appliances can cause conditions known as backdrafting or reverse stacking, which force contaminated air back into the home.