The second refers to improper wind speed. One is that the sharp wind comes from cutting the face with a knife, forming a strong sense of suffocation like a knife and arrow, which is easy to make people suffer from the disaster of blood loss in Feng Shui, and it will also destroy the balance of the gas field around the house, making it difficult for people to adapt, or blowing away the prosperous gas field; The other is "dead air", that is, there is no wind at all, the air does not circulate or flow, and a large amount of exhaust gas discharged by people in the family stays indoors, causing air pollution.
Therefore, the tuyere is best to "hide the wind and gather gas." The tuyere should face southeast, avoid the cold northwest wind, and the wind speed should be moderate. It should be no violence, no wind, dirty air and no convection. According to the characteristics of monsoon climate in the northern hemisphere of our country, it is best to sit facing south, and the large windows and balcony doors of apartment buildings and high-rise houses should face south, so that the warm south wind can blow in.