Opragon 16 is meant to be mounted in the false ceiling in operating theatres used for infection sensitive surgery. The unit is supplied with slightly cooled, HEPA-filtered air of class H14 from an external ventilation unit equipped with a warming/cooling battery. The air is supplied through the sixteen airshowers. Their unique design in conjunction with the cooler air's higher density creates an operative zone of ultra-clean air utilizing the TLA principle (Temperature controlled Laminar Airflow). In a complete TLA installation, see exemple reverse side, class ISO 5/CFU ≤5 can be maintained in the operative zone and ISO 6/CFU ≤5 maintained in other parts of the room according to ISO 14644-1 guidelines (provided that other requirements on cleanliness and clothing is adhered to).