An apparatus for decontaminating a region within an enclosure. The apparatus comprises a conduit having a passageway therethrough that defines a path for a carrier gas. A plurality of tube sections, each of the tube sections having an opening extending therethrough, is selectively movable into and out of a gap in the conduit. A heating element is disposed in one of the tube sections and is operable to heat the carrier gas flowing therethrough. A destroyer is disposed in another of the tube sections and is operable to destroy sterilant in the carrier gas. A controller controls movement of the tube sections into and out of the gap.