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).
Fall of the Qing Dynasty. The Boxer Rebellion weakened the Qing dynasty, which was the last imperial dynasty of China and ruled the country from 1644 to 1912. It was this dynasty that established the modern territory of China. The diminished state of the Qing dynasty after the Boxer Rebellion opened the door to the Republican Revolution of 1911 that overthrew the emperor and made China a republic. The Republic of China, including mainland China and Taiwan, existed from 1912 to 1949.