The GCX unit is for serious control of gases and/or chemicals that may be present, in addition to giving you excellent particulate control at the same time.Compared to the GC Series the GCX Series features nearly 75% more filtration media (8 Kilograms versus 2.5 kilograms in the GC Series) and as a result provides about 20% more airflow and longer filter service life.You cannot get better protection from any other product on the market.