Clean bench is a kind of box type air purification equipment that can provide local clean, clean, aseptic working environment grade 100 (ISO grade 5) local operating environment.The polluted air in the working area can be artificially controlled through a special filter channel to avoid harm to people and the environment.In the working status can keep working space within the wind speed, air cleanliness, noise, vibration and lighting performance parameters meet the requirements of laboratory use, widely used in biological laboratory, medical and health, biological pharmaceutical industry, to improve the process conditions, to protect the operator's health, improve product quality and yield have good effect.