If all air conditioning were to be classified into two groups—comfort air conditioning and industrial air conditioning—the basic difference would be in the objective. Comfort air conditioning is performed for people, while industrial air conditioning is directed toward processes. On the air side, industrial air conditioning differs in one or more features: level of temperature, need for precise humidity control, a higher standard of filtration, and the removal of contaminants. Industrial air conditioning appears in such applications as printing plants, where humidity control is essential for proper registration of multicolor printing; textile plants, to help prevent fibers from breaking and to reduce static electricity; the manufacture of photographic materials; clean rooms for manufacturing of electronic equipment; and in a wide variety of laboratories. One difference between refrigeration for comfort and for industrial air conditioning might be in the higher precision of temperature control usually demanded for industrial air conditioning.