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).
Like most Chinese dynasties, the Qing Dynasty had powerful and long-lived rulers at the beginning of the dynastic era, a period of prosperity in the beginning and middle of their dynastic era, and natural disasters, rebellions, invasions and inept ruling courts at the end.