1. Disassembly method: if the size of the flue is too small (less than 40 cm) and manual access is impossible, this method is adopted. According to the actual situation of the site, the cleaning personnel disassemble a section of flue at a certain distance and extend it to both sides for cleaning. This method has good cleaning effect, great difficulty and high cost.

2、人工進入法：對于清潔工人可以鉆進去的平行煙道（大于40公分）可以人工進行清理，此法勞動強度較大，清洗效果也是較好的，不過需要注意加強通風，配備低壓（36伏）照明電源。

2. Manual entry method: the parallel flue (more than 40 cm) that can be drilled by cleaners can be cleaned manually. This method has high labor intensity and good cleaning effect. However, attention should be paid to strengthening ventilation and equipping low-voltage (36 V) lighting power supply.

3、開孔法：有些煙道人工無法進入，也不容易拆卸時可以采用此法，清潔人員要采用專用無火花開孔工具將油煙管道的一方或多方開孔，開孔大小、距離、數量根據現場情況而定，開孔后再進行人工清洗，油污清理完后將管道密封復原。

3. Opening method: this method can be used when some flue cannot be accessed manually and it is not easy to disassemble. The cleaning personnel shall use a special non sparking opening tool to open one or more holes of the oil fume pipeline. The size, distance and quantity of the holes shall be determined according to the site conditions. After the holes are opened, they shall be cleaned manually, and the pipeline shall be sealed and restored after the oil stain is cleaned.

4、油煙機器人清洗法：對于油污較少，清洗周期短且不易拆卸和人工無法進入的煙道采用此法清理，先將管道內噴灑專用清洗劑，使油污軟化，再使用油煙清洗機器人進行遙控清洗，長的電動軟軸刷將油污刷洗干凈，此法多用于豎管道。

4. Oil fume robot cleaning method: this method is used to clean the flue with less oil stain, short cleaning cycle, difficult disassembly and inaccessible manually. First spray special cleaning agent in the pipeline to soften the oil stain, and then use the oil fume cleaning robot for remote cleaning. The oil stain is cleaned with a long electric flexible shaft brush. This method is mostly used for vertical pipelines.

5、空降法：此法主要用于清洗50公分見方以上的豎煙道，清洗人員先拆下管道的上截和下截，在煙道上方固定高空繩，系上帶，清洗人員從上下清洗豎煙道內的油污。此法危險性較大，技術性強，費用較高，清理效果好。由于豎煙道一般積油較少一年清洗一次即可。

5. Airborne method: this method is mainly used to clean the vertical flue above 50 cm square. The cleaning personnel first remove the upper and lower sections of the pipeline, fix the high-altitude safety rope above the flue, fasten the safety belt, and the cleaning personnel clean the oil stain in the vertical flue from top to bottom. This method has the advantages of high risk, strong technicality, high cost and good cleaning effect. As the vertical flue generally has less oil accumulation, it can be cleaned once a year.

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