For the more difficult to clean the exhaust pipe, you can use manual entry method, for more than 45 centimeters of parallel smoke pipe can be manually drilled in to clean. But need to pay attention to strengthen ventilation, equipped with low-voltage (36-volt) lighting power.

3, for the artificial can not clean the place, you can use the demolition method, cleaning personnel should be based on the actual situation on the scene, every certain period of time to dismantle a section of the flue to the two sides of the extension of the cleanup, this method is effective, but difficult, high cost.

4, cleaning personnel can use special non-sparking open hole tool to open the pipe, this method is inaccessible and more difficult to dismantle the flue using this method. The size of the hole, the interval, the number can be determined according to the site conditions, oil cleanup will be sealed after the pipe recovery.