Now let's look at the disadvantages: 1  You don't know where the makeup air is coming from. 2  Contaminants from an attached garage or moldy crawl space can be pulled into the house. 3  Ventilation air probably won't be mixed or distributed well. 4  The only filtration that happens is through the building enclosure.
The Qing Dynasty (1644â1912) was the last Chinese dynasty, and the longest dynasty ruled by foreigners (Manchus from Manchuria, northeast of the Great Wall).
During the late period of the Ming period, the government was weak and the throne was in danger. Not only was there an uprising by Han people, there were also invasions of the Mongolians from the North and the Manchus from the Northeast.After much struggle, the dynasty collapsed and the Manchus succeeded in ruling China and founded the Qing dynasty.he early Qing emperors were very capable and intelligent. Emperor Kangxi (the second emperor of Qing dynasty) was a capable leader and administrator.