风口的数量取决于自己要求的房间总的风量，知道房间的总风量后，按照平面布置的要求来确定房间内风口的数量，每个风口的平均风量按照上述风管计算方式来计算风口的尺寸。
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.
但是风口的尺寸要根据风口的形式来区别对待，一般每个风口厂家都会提供每个风口的实际出风面积，这个实际出风面积才是上述计算的实际截面积，一般吊顶高度在3米以下的风口出风风速需要控制在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.
新风量一般按人头算，比如100平米的房间，根据房间功能查得人口密度。
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个人，那100平米房间就是33个人左右，再查得这房间的每个人需要的新风是多少。比如是20m每个人每小时，那么这个房间的新风量就是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.
还有其他例如换气次数法，不再赘述。知道了风量，接下来就是算风管和风口。
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.
风量=风管截面积x风速x3600，新风的风管风速是4.5~5.5m/s。比如刚才的例子，现在风速选5，风管截面积=660/(3600x5)=0.036平米，所以此处应该选择200mmx200mm的风管。风口的风速一般3m/s，同样，风口应该选择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
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