This fast stage change makes sure the vapor is diluted and dispersed within an enclosure, keeping concentrations below the dew position during the biodecontamination cycle. The look and growth of the decontamination cycle commonly takes place upon completion with the OQ. USP3 once again gives steering on this subject https://medium.com/@tailinscitech/vhp-sterilization-solutions-by-tailin-bioengineering-protecting-pharma-and-laboratory-environments-b515737bff96