An apparatus for decontaminating articles comprised of:a decontamination chambera conveyor for conveying articles to be decontaminated along a first path through said decontamination chambera vaporizing unit connected to said decontamination chamber, said vaporizing unit disposed above said decontamination chambera blower for conveying a carrier gas through said vaporizing unit and through said decontamination chamberheating means for heating said carrier gas flowing through said vaporizing unit a source of liquid hydrogen peroxide fluidly connected to said vaporizing unitand an injection device for injecting liquid hydrogen peroxide into said vaporizing unit.