TL-BSC-IIA2-7 is a product of BSC Class II Type A2, which can protect effectively all of the researcher, product and environment. 70 % of the airflow at work space is re-circulated through the HEPA filter, and 30% of it is exhausted to the outside through HEPA filter, and the polluted airflow is not leaked as perfectly surrounded by the negative pressure. Especially, the inclined front structure reduces the glares, or burden on the neck, arms etc.