Air purifier, also known as "air cleaner", air freshener, refers to products that can adsorb, decompose or convert all kinds of air pollutants and effectively improve air cleanliness, mainly domestic and commercial air purifiers that remove indoor air pollution.

Purification engineering is a very extensive basic supporting industry in electronic information, optoelectronics, semiconductors, medicine and health, aerospace, bioengineering, precision manufacturing, automobile spraying and many other industries, and according to the precision and dust-free requirements of the industry, the grade difference is also large.

Epoxy floor paint, pvc floor and other materials are generally used for the ground of the purification plant.