The number of air outlets depends on the total air volume of the room. After knowing the total air volume of the room, the number of air outlets in the room shall be determined according to the requirements of the plane layout. The average air volume of each air outlet shall be calculated according to the above air duct calculation method.

　　但是風口的尺寸要根據風口的形式來區別對待，一般每個風口廠家都會提供每個風口的實際出風面積，這個實際出風面積才是上述計算的實際截面積，一般吊頂高度在3米以下的風口出風風速需要控制在2-3m/s。

　　However, the size of the tuyere shall be treated differently according to the form of the tuyere. Generally, each tuyere manufacturer will provide the actual air outlet area of each tuyere, which is the actual cross-sectional area calculated above. Generally, the air outlet speed of the tuyere with the ceiling height less than 3m shall be controlled within 2-3m / s.

　　新風量一般按人頭算，比如100平米的房間，根據房間功能查得人口密度。

　　The fresh air volume is generally calculated according to the head, such as a room of 100 square meters, and the population density is calculated according to the function of the room.

　　比如是3平米有1個人，那100平米房間就是33個人左右，再查得這房間的每個人需要的新風是多少。比如是20m每個人每小時，那么這個房間的新風量就是660m。

　　For example, if there is one person in the room of 3 square meters, the room of 100 square meters is about 33 people. Then find out how much fresh air each person needs in this room. For example, 20 m per person per hour, the fresh air volume of this room is 660 M.

　　還有其他例如換氣次數法，不再贅述。知道了風量，接下來就是算風管和風口。

　　There are other methods, such as air change rate method, which will not be described in detail. Knowing the air volume, the next step is to calculate the air duct and air outlet.

　　風量=風管截面積x風速x3600，新風的風管風速是4.5~5.5m/s。比如剛才的例子，現在風速選5，風管截面積=660/(3600x5)=0.036平米，所以此處應該選擇200mmx200mm的風管。風口的風速一般3m/s，同樣，風口應該選擇300x200.

　　Air volume = sectional area of air duct X wind speed x 3600, and the wind speed of fresh air duct is 4.5 ~ 5.5m/s. For example, in the example just now, when the wind speed is 5, the cross-sectional area of the air duct is 660 / (3600x5) = 0.036m2, so 200mmx200mm air duct should be selected here. The wind speed of the tuyere is generally 3m / s. similarly, the tuyere should be 300x200