This equipment is used to obtain and maintain cleanliness for the purpose of preventing pollution in indoor working and residential environments. Cleanliness is the most important, and in recent years, due to the advanced development of industrial technology, high cleanliness is required in all industrial fields. It is created to keep dust and particulates in the indoor air to a minimum and to control indoor pressure, humidity, temperature, distribution and speed of air currents, etc. within a certain range.