Each individual cycle of the VHP small-temp sterilizer is characterised by the type of units that can be processed in that cycle. For example, the non-lumen cycles can't be accustomed to sterilize a lumened device or a versatile scope. New sterile air or nitrogen is circulated right after decontamination. https://tryhere88653.wikitron.com/2320434/little_known_facts_about_vhp_sterilization_of_isolators