What aromatherapy and fragrance spraying systems do hotels usually use?

At present, most hotels, shopping malls, fine arts institutes, clothing stores, 4S stores, sales centers and high-end office buildings will introduce fragrance systems (fragrance spreaders), which can not only remove all kinds of odors, but also enhance customers' impression. Exclusive fragrance will make customers subconsciously remember the taste of this brand, enhance the brand awareness of customers, and play the role of another brand promotion, because the original fragrance system is mainly used in star-rated hotels, such as Shangri-La and Westin.