For parallel flue larger than 40 cm square, it can be cleaned by manual drilling. This method is labor-intensive, so it is necessary to strengthen ventilation and equip with low-voltage (36V) lighting power supply.

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2. Disassembly method:

When the flue is less than 40 square centimeters, this method is used when it is impossible to enter manually.

This method is the most thorough and best cleaning method, but it is difficult to construct, requires a lot of workers, and the cost is relatively high. The scheme of flue cleaning is: according to the actual situation of flue, technicians calculate that a section of flue should be removed at regular intervals and extended in two directions to ensure thorough cleaning and cleaning quality.

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3. Opening method:

Compared with the disassembly method, this method is relatively easy and low cost. This method is used for the flue which cannot be accessed manually and is difficult to disassemble. Technicians can calculate the spacing distance, opening position, size and number of holes, and then clean the flue through these holes. Finally, each hole is sealed.