With the Pure Aire Class 100 (ISO 5) OH-P Series filtered air enters through the absolute filter ceiling flowing directly down and out at the bottom, carrying with it any bacteria and other harmful microorganisms generated with the ultra-clean area, as well as providing protection against contamination from outside.  You can place the clean area over large bulky objects instead of trying to move the object to an existing cleanroom.  The Pure Aire portable cleanroom is sometimes added to a conventional non-laminar flow cleanroom to provide a super-clean environment in a specific area. Portable cleanrooms are ideally suited for some of the following procedures as follows but not limited to: