The ROOMVENT 2022 will be held in Xi’an, China. Xi’an, known as “Chang’an” in ancient times, is one of the four world’s most famous ancient capitals. Thirteen Dynasties including the Western Zhou, the Han, the Sui and the Tang established their capitals here. The city’s capital status lasted for more than 1100 years. As regards the number of dynasties, the span of time and the influence in Chinese history, Xi’an ranks first among Chinese ancient capitals.