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．層數超過32層的高層建筑，其送風系統及送風量應分段設計。

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

3．剪刀樓梯間可合用一個風道，其風量應按二個樓梯間風量計算，送風口應分別設置。

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．封閉避難層（間）的機械加壓送風量應按避難層凈面積每不小于30立方米/小時計算。

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．機械加壓送風的防煙樓梯間和合用前室，宜分別獨立設置送風系統，當必須共用一個系統時，應在通向合用前室的支風管上設置壓差自動調節裝置。

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．機械加壓送風機的全壓，除計算*不利環管道壓頭損失外，尚應有余壓。其余壓值應符合下列要求：

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) 防煙樓梯為40Pa-50Pa；

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

(2) 前室、合用前室、消防電梯前室、封閉避難層（間）為30Pa–25Pa。

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

7．樓梯間宜每隔二三層設一個加壓送風口；前室的加壓送風口應每層設一個。

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．機械加壓送風機可采用軸流風機或中、低壓離心風機，風機位置應根據供電條件、風量分配均衡、新風入口不受火煙威脅等因素確定。

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．帶裙房的高層建筑防煙樓梯間及其前室，消防電梯前室或合用前室，當裙房以上部分利用可開啟外窗進行自然排煙，裙房部分不具備自然排煙條件時，其前室或合用前室應設置局部正壓送風系統。

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．防煙樓梯間的加壓送風口應采用自垂式百葉風口或常開的雙層百葉風口，當采用常開的雙層百葉風口時，應在其加壓風機的吸入管上設置與開啟風機連鎖的電動閥。

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．前室的加壓送風口應為現場手動打開或與火災自動報警聯動打開的常閉百葉風口。

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．機械加壓送風機可設置一臺或多臺。機械加壓送風機房應采用耐火極限不低于2.5小時的隔墻和1.5小時的樓板與其他部位隔開,隔墻上的門應為防火門。

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．機械加壓送風口的風速不宜大于7m/s。樓梯間的風口截面按樓梯間總送風量的平均值計算，前室的風口截面按前室總風量的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．前室機械加壓送風口宜設置在靠近地面的墻面上。

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