Class A laminar air flow is an air purification equipment that provides Class A unidirectional flow and creates a local high cleanliness environment. Its working principle is to pass the air through the HEPA filter at a certain wind speed, and the pressure is equalized by the unidirectional membrane so that the clean air is unidirectionally flowed to the working area. 

Class A laminar air flow can be used singly or in combination. The working area of Class A laminar air flow is the core sterile area, the operators need to open the equipment from the class-B area environment according to the defined SOP to carry out process operation and intervention. These actions need to be formulated according to the risk of the product. The operator should avoid contacting with the core sterile area. If contact is needed, it should be done through isolation gloves or body suit.