排烟风机可采用离心式或轴流排烟风机(满足280℃时连续工作30min的要求)，排烟风机入口处应设置能自动关闭的排烟防火阀，并联锁关闭排烟风机。4.4.2排烟风机宜设置在排烟系统的顶部，烟气出口宜朝上，并应高于加压送风机的进风口，两者垂直距离不应小于3m或水平距离不应小于10m。当系统中任一排烟口或排烟阀开启时，排烟风机应能自行启动。
The smoke exhausting fan can adopt centrifugal or axial flow exhaust fan (meet the requirement of continuous working 30min at 280 degrees C). The smoke exhaust fan at the entrance of the exhaust fan should be set up automatically and interlock and close the exhaust fan. The 4.4.2 exhaust wind machine should be set at the top of the exhaust system. The flue gas exit should be upwards, and should be higher than the inlet air inlet of the pressure fan. The vertical distance should not be less than 3m or the horizontal distance should not be less than 10m. When a smoke vent or smoke valve is opened, smoke exhaust fans should be able to start automatically.
1.排烟风机应设置在专用的风机房内或室外屋面上，风机房应采用耐火极限不低于2.0h的隔墙和1.5h的楼板及防火门与其它部位隔开。当条件受到限制时，可设置在专用空间内，空间四周的围护结构应采用耐火极限不低于1.0h的不燃烧体，风机两侧应有600mm以上的空间。当必须与其他风机合用机房时，应符合下列条件：
1. smoke exhausting fan should be set up in the special fan room or outdoor roof. The wind machine room should be separated from the wall of the fire-resistant limit not less than 2.0h and the floor of 1.5h and the first class fire door. When the condition is restricted, it can be set in the special space. The enclosure structure around the space should adopt the non combustion body with the fire resistance limit less than 1.0h, and the two sides of the fan should have more than 600mm space. When the engine room must be combined with other fans, the following conditions shall be met:
1）机房内应设有自动喷水灭火系统；
1) the automatic sprinkler system should be set up in the machine room.
2）机房内不得设有用于机械加压送风的风机与管道；
2) no fan or pipeline for mechanical pressurized air supply can be installed in the engine room.
3）排烟风机与排烟管道上不得设有软接管。
3) no soft nozzle should be installed on the exhaust fan and exhaust pipe.
室外排烟风机
Outdoor exhaust fan
2.排烟管道必须采用不燃材料制作，当采用金属管道时，管道内风速不宜大于20m/s；当采用内表面光滑的混凝土等非金属材料管道时，不宜大于15m/s。4.4.5当吊顶内有可燃物时，吊顶内的排烟管道应采用不燃烧材料进行隔热，并应与可燃物保持不小于150mm的距离。
The 2. exhaust pipe must be made of non combustible materials. When metal pipes are used, the wind speed should not be greater than 20m/s, and it should not be greater than 15m/s when using the smooth concrete and other nonmetallic materials. 4.4.5 when there are combustible materials in the ceiling, the exhaust pipes in the ceiling should be insulated with non burning materials and should be kept at a distance not less than 150mm from the combustible materials.
3.当火灾确认后，同一排烟系统中着火防烟分区的排烟口或自动排烟阀应呈开启状态，其他防烟分区的排烟阀或排烟口应呈关闭状态。
3. when the fire is confirmed, the smoke vent or the automatic exhaust valve should be open in the same exhaust system in the same exhaust system, and the smoke relief valve or exhaust port of other smoke prevention areas should be closed.
4.排烟系统与通风、空气调节系统宜分开设置。当合用时，应符合下列条件：
4. smoke exhaust system and ventilation and air conditioning system should be separately set. When used, the following conditions should be met:
1）系统的风口、风道、风机等应满足排烟系统的要求；
1) the draught, air duct and fan of the system should meet the requirements of smoke exhaust system.
2）当火灾被确认后，应能开启排烟区域的排烟口和排烟风机，并在15s内自动关闭与排烟无关的通风、空调系统。
2) when the fire is confirmed, the smoke vent and smoke exhaust fan in the smoke exhaust area can be opened, and the ventilation and air conditioning system which has nothing to do with the exhaust gas is automatically closed in the 15s.
5.排烟井道应采用耐火极限不小于1h的隔墙与相邻区域分隔；当墙上必须设置检修门时，应采用丙级防火门；水平排烟管道穿越防火墙时，应设排烟防火阀；当穿越两个及两个以上防火分区或排烟管道在走道的吊顶内时，其管道的耐火极限不应小于1h；排烟管道不应穿越前室或楼梯间，如确有困难必须穿越时，其耐火极限不应小于2h。
The 5. exhaust well shall be separated from the adjacent area with a fire-resistant limit of not less than 1h, and a class C fire protection gate should be adopted when a door must be set up on the wall; when a horizontal exhaust pipe passes through a firewall, a fire relief valve should be set up; when crossing two and more than two fire zones or smoke pipes in the ceiling of the aisle The fire resistance limit should not be less than 1h; the exhaust pipe should not pass through the front room or stairwell. If the difficulty is necessary, the fire resistance limit should not be less than 2H.
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