专注通风管道加工·排烟罩

1. The mechanical pressurized air supply volume of smoke proof staircase and its antechamber, shared antechamber and fire elevator antechamber of high-rise buildings shall be determined by calculation or by looking up the table. When the calculated value is inconsistent with the table lookup result, the larger value shall be determined.

2．层数超过32层的高层建筑，其送风系统及送风量应分段设计。

2. The air supply system and air supply volume of high-rise buildings with more than 32 floors shall be designed by sections.

3．剪刀楼梯间可合用一个风道，其风量应按二个楼梯间风量计算，送风口应分别设置。

3. The scissors staircase can share one air duct, and its air volume shall be calculated according to the air volume of two staircases, and the air supply outlets shall be set separately.

4．封闭避难层（间）的机械加压送风量应按避难层净面积每不小于30立方米/小时计算。

4. The mechanical pressurized air supply volume of the enclosed refuge floor (room) shall be calculated according to the net area of the refuge floor not less than 30 m3/hour per square meter.

5．机械加压送风的防烟楼梯间和合用前室，宜分别独立设置送风系统，当必须共用一个系统时，应在通向合用前室的支风管上设置压差自动调节装置。

5. The smoke proof staircase and shared antechamber for mechanical pressurization air supply should be separately equipped with air supply system. When a system must be shared, automatic differential pressure adjustment device should be set on the branch air duct leading to the shared antechamber.

6．机械加压送风机的全压，除计算*不利环管道压头损失外，尚应有余压。其余压值应符合下列要求：

6. For the total pressure of mechanical pressurized forced draft fan, in addition to calculating the head loss of the unfavorable ring pipe, there should also be residual pressure. Other pressure values shall meet the following requirements:

(1) 防烟楼梯为40Pa-50Pa；

(1) Smoke proof stair is 40Pa - 50Pa;

(2) 前室、合用前室、消防电梯前室、封闭避难层（间）为30Pa–25Pa。

(2) The front room, shared front room, fire elevator front room and enclosed refuge floor (room) are 30Pa – 25Pa.

7．楼梯间宜每隔二三层设一个加压送风口；前室的加压送风口应每层设一个。

7. The staircase should be equipped with a pressurized air supply outlet every second to third floor; One pressurized air supply outlet shall be set for each floor of the front room.

8．机械加压送风机可采用轴流风机或中、低压离心风机，风机位置应根据供电条件、风量分配均衡、新风入口不受火烟威胁等因素确定。

8. Axial flow fan or medium and low pressure centrifugal fan can be used for mechanical pressurized air supply fan. The fan position shall be determined according to power supply conditions, balanced air volume distribution, and no fire and smoke threat to fresh air inlet.

9．带裙房的高层建筑防烟楼梯间及其前室，消防电梯前室或合用前室，当裙房以上部分利用可开启外窗进行自然排烟，裙房部分不具备自然排烟条件时，其前室或合用前室应设置局部正压送风系统。

9. For smoke proof staircases and their antechambers of high-rise buildings with podiums, fire elevator antechambers or shared antechambers, when the parts above the podium use openable external windows for natural smoke exhaust, and when the podium does not have natural smoke exhaust conditions, its antechambers or shared antechambers shall be equipped with local positive pressure air supply system.

10．防烟楼梯间的加压送风口应采用自垂式百叶风口或常开的双层百叶风口，当采用常开的双层百叶风口时，应在其加压风机的吸入管上设置与开启风机连锁的电动阀。

10. The pressurized air supply outlet of smoke proof stairwell shall be a vertical louver outlet or a normally open double louver outlet. When a normally open double louver outlet is used, an electric valve interlocked with the open fan shall be set on the suction pipe of its pressurized fan.

11．前室的加压送风口应为现场手动打开或与火灾自动报警联动打开的常闭百叶风口。

11. The pressurized air supply outlet of the front room shall be a normally closed louver air outlet that is manually opened on site or linked with the automatic fire alarm.

12．机械加压送风机可设置一台或多台。机械加压送风机房应采用耐火极限不低于2.5小时的隔墙和1.5小时的楼板与其他部位隔开,隔墙上的门应为防火门。

12. One or more mechanical forced draft fans can be set. The mechanical pressurized air supply room shall be separated from other parts by partitions with a fire resistance rating of not less than 2.5 hours and floors with a fire resistance rating of 1.5 hours. The doors on the partitions shall be Class A fire doors.

13．机械加压送风口的风速不宜大于7m/s。楼梯间的风口截面按楼梯间总送风量的平均值计算，前室的风口截面按前室总风量的50%。

13. The wind speed at the mechanical pressure air supply outlet shall not be greater than 7m/s. The air outlet section of the stairwell is calculated as the average of the total air supply volume of the stairwell, and the air outlet section of the antechamber is 50% of the total air volume of the antechamber.

14．前室机械加压送风口宜设置在靠近地面的墙面上。

14. The mechanical pressure air supply outlet of the front room should be set on the wall near the ground.