First. Often determine the combustion and ventilation during use. Second. The boiler surrounding li

First. Often determine the combustion and ventilation during use. Second. The boiler surrounding limit the storage and use of flammable substances. Third. Fall into a hole in the exhaust or feel that you have ever used and then OK. Fourth. Must not contain or insects, such as the cold wind coming Obstructing the ventilation grilles absolute. Says it may cause an explosive fire. Finally, the fifth. Called out the help of a professional when in doubt. So five kinds of safety polytec remember hasyeoseo You must do their best to prevent accidents.
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