This invention relates to apparatus for use with a sterilant vapour generator used for sterilising an enclosure, said apparatus providing means for enhancing the distribution of the sterilant vapour in the enclosure during a gassing phase of the sterilisation process and for removing the s-terilant vapour from the air in the enclosure during a subsequent aeration phase. The apparatus can optionally be configured to provide humidification, if required. The invention therefore comprises means for the distribution of sterilant vapour in the enclosure during a gassing phase of the sterilisation process and means for removing the sterilant from the air in- the enclosure during an aeration phase.
