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 (1644-1911) is notable for two important emperors. â¢Kangzi Emperor was the longest-ruling emperor in China's history (sixty-one years); wrote the most complete Chinese dictionary; and tried to adopt Western technology. â¢Qianlong Emperor had conflicts with European imperialism that took shape with the opium trade; and demanded that Europe trade with silver.