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Heat transfers to cold spontaneously
When you start a fire, the heat rushes up to the top of the chimney. Once the fire is going well, the entire chimney becomes hot. In order to maintain a clean and safe chimney, you have to keep the chimney pipe above 212. Below 212 is when residue (creosote) adheres to the chimney surface. Because pressed wood smokless logs burn hotter than tree wood, the chimney stays above 212 and therefore remains clean longer.
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