The Basic Oxygen Furnace is a vessel used by steelmakers to convert liquid iron (pig iron) into steel by burning out most of the remaining carbon, silicon and other impurities which are present in iron at about 6% but less than 1% in steel. The process that occurs in the B.O.F. is called basic oxygen steel making. The word basic refers to the presence of fluxes of lime or dolomite which maintain an alkali pH balance or chemically “base” condition in the furnace. The fluxes help in removing impurities and in preserving the lining of the BOF vessel. Typically, molten iron arrives directly from the blast furnace and is poured into the BOF vessel on top of some pre – positioned scrap steel and flux materials. This is known as charging the furnace. An oxygen lance is then introduced and high purity oxygen is blown in at high speed and under pressure. The conversion process, iron into steel, takes about 20 minutes and finishes with the furnace being tilted to allow molten steel to pour out through a tap hole. Finally the residues – slag – are poured out by further tilting the furnace. High temperature fume is released during charging, lancing, and pouring/tapping. This fume must be captured by carefully designed hoods/canopies and treated in an air pollution control system designed to deal with the temperature variations that occur throughout the process. Diluting the high temperature fume with colder polluted air from other sources is a good solution. The AAF FabriPulse XLC is an ideal filter for this application as part of an integrated pollution control system.