Why is soot or crud in the oil fired boiler or furnace flue a problem?
When we look in to the flue close to the heating boiler or furnace, such as at the barometric damper shown here, it’s normal to see a thin coating of soot on the interior of the metal flue pipe. But thick soot in the flue, the chimney, or inside of the boiler or furnace heat exchanger is a problem. Because soot acts like an insulating coating, too much soot in a heating system causes both system operating problems problems and increased heating cost for the building. These soot problems on oil fired heating equipment are discussed in detail at SOOT on OIL FIRED HEATING EQUIPMENT. .
