Custom procedure trays are used to hold some hospital or laboratory tools such as forceps, syringes, and the like. These tools must be clean and free from contaminants before being used for surgical operation. Therefore, custom procedure trays should also be free from contaminants.
In operating rooms and hospital storage rooms, pressurization is applied. This is to ensure that the airflow is thick and static in order to contain the air from moving anywhere. This is because the airflow in such areas may be contaminated with airborne diseases.