The RABS does not come hermetically sealed, but usable as a dynamic barrier which is created by the flow of air into the chamber. RABS systems guarantee protection by providing an aerodynamic barrier to a critical processing area. Under operational settings the RABS is made to use a dedicated, aeraulic circuit which maintains a slightly (low pressure) or negative pressure less that the external pressure. When RABS are installed in ISO7 environments, they already have a clean-room air class and are, therefore, able to provide ISO5 quality in a critical area. ALS has assessed and identified based on the standards of manufacturing and for safety, the following essential factors for the design: operator protection and safety. The purpose of the system is to contain dispersion of powdered products during packaging (product protection) and to reduce the risk of exposure for the member of staff handling the product (operator protection).