| 摘要 |
In a built-in chimney, the lockable door leaves 23, 24 placed in front of the hearth on the user side are equipped with at least one window 29 to 34 and, on the internal portion, with a dismantleable frame surrounding the window 29 to 34 and intended to receive at least one removable plate closing off the said window. A sealing zone 41 provided at the height of the grid inside the door leaves 23, 24 may comprise interruption points forming ventilation ducts. <IMAGE>
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