| 摘要 |
The insulation block is for closure doors of heating boilers with reversal burner chamber and consists of a disc-shaped shaped body and refractory material. The shaped body (1) is provided, at least in the region of about one half, with a surface (2) on the combustion chamber side, which is inclined, or is placed with an inclination or at a higher level, relative to the remaining surface (3). <IMAGE>
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