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.排煙風機應設置在專用的風機房內或室外屋面上，風機房應采用耐火極限不低于2.0h的隔墻和1.5h的樓板及防火門與其它部位隔開。當條件受到限制時，可設置在專用空間內，空間四周的圍護結構應采用耐火極限不低于1.0h的不燃燒體，風機兩側應有600mm以上的空間。當必須與其他風機合用機房時，應符合下列條件：

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）機房內應設有自動噴水滅火系統；

1) the automatic sprinkler system should be set up in the machine room.

2）機房內不得設有用于機械加壓送風的風機與管道；

2) no fan or pipeline for mechanical pressurized air supply can be installed in the engine room.

3）排煙風機與排煙管道上不得設有軟接管。

3) no soft nozzle should be installed on the exhaust fan and exhaust pipe.

室外排煙風機

Outdoor exhaust fan

2.排煙管道必須采用不燃材料制作，當采用金屬管道時，管道內風速不宜大于20m/s；當采用內表面光滑的混凝土等非金屬材料管道時，不宜大于15m/s。4.4.5當吊頂內有可燃物時，吊頂內的排煙管道應采用不燃燒材料進行隔熱，并應與可燃物保持不小于150mm的距離。

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.當火災確認后，同一排煙系統中著火防煙分區的排煙口或自動排煙閥應呈開啟狀態，其他防煙分區的排煙閥或排煙口應呈關閉狀態。

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.排煙系統與通風、空氣調節系統宜分開設置。當合用時，應符合下列條件：

4. smoke exhaust system and ventilation and air conditioning system should be separately set. When used, the following conditions should be met:

1）系統的風口、風道、風機等應滿足排煙系統的要求；

1) the draught, air duct and fan of the system should meet the requirements of smoke exhaust system.

2）當火災被確認后，應能開啟排煙區域的排煙口和排煙風機，并在15s內自動關閉與排煙無關的通風、空調系統。

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.排煙井道應采用耐火極限不小于1h的隔墻與相鄰區域分隔；當墻上必須設置檢修門時，應采用丙級防火門；水平排煙管道穿越防火墻時，應設排煙防火閥；當穿越兩個及兩個以上防火分區或排煙管道在走道的吊頂內時，其管道的耐火極限不應小于1h；排煙管道不應穿越前室或樓梯間，如確有困難必須穿越時，其耐火極限不應小于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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