| 摘要 |
A fire-retarding smoke sauna, in which the walls 1 and the roof 3 are of lightweight concrete and/or lightweight gravel concrete, for example a type where light gravel is used instead of coarse aggregate alongside the cement and water. The walls 1 extend as such so far downwards into the soil as to form the foundation 2 of the building, or they extend over a separate foundation, for example a footing plate. <IMAGE>
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