Promp Tech biological safety cabinet class 2 type A2 provide personal environmental and product protection airflow is drawn around the operator into the front grill of the cabinet, which provides personnel protection, In addition, the downward laminar flow of HEPA-filtered air provides product protection by minimizing the chance of cross-contamination along the work surface of the cabinet. Because cabinet air has passed through the exhaust HEPA filter. it is contaminant-free (environment protection).