горение сажи в трубе
Так горит сажа
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![Как очистить котел от сажи [самый легкий способ]](https://sun9-67.userapi.com/SSHNU6VLqCYjXHN5ae4D_DhsnhZj3sk3w7VUzg/iqxsWtcErTA.jpg)
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