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).
The Qing Dynasty. Although they were the last they were not the  worst. The rulers of this dynasty were called the Manchus  (Manchurians) They took advantage of the Ming Dynâ¦asties weaknesses  and decided to take over in 1594. The tried to restrict foreign  influence on China and allowed little trade.