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