Dynamic Passboxes and Dynamic Floor Label Hatches are aseptic architectural systems utilized to prevent contaminants from leaking into aseptic suits. They are utilized for aseptic transfer of materials into and out from the critical process environments. Basic Principles: Dynamic airflow provides an air barrier to prevent contaminant from entering into critical controlled environments during material transfers. Vertical purge, purges any trace contaminants that could have entered post material transfer. Airflow set at dual re-circulatory on both sides.