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).
It was preceded by the Ming dynasty and succeeded by the Republic of China. The Qing multi-cultural empire lasted almost three centuries and formed the territorial base for the modern Chinese state. The dynasty was founded by the Jurchen Aisin Gioro clan in Manchuria.urhaci formed these clans into a unified entity, the subjects of which became known collectively as the Manchu people. By 1636, his son Hong Taiji began driving Ming forces out of Liaodong and declared a new dynasty, the Qing.