In a certain range of space, remove the micro particles, harmful air, bacteria and other pollutants in the air, and control the indoor temperature, cleanliness, pressure, airflow speed and airflow distribution, noise vibration and lighting, and static electricity within a certain range of demand in the engineering discipline.The room specially designed by the purification project, no matter how the external air condition changes, the room has the performance of maintaining the cleanliness, temperature, humidity, pressure and so on.