The ceramic fibre plate is fixed by adhesive (11) to the slide plate (7) coated with stretch metal (12), and projects over the frame (10). It has the same height as the frame and sealing of the soot blower box (5) is additionally effected by a fireproof cord. Bent tubes (17) incorporated are provided with anchors (19) and have a foil (18) wound around them. They are also partly surrounded by a ceramic glass wool (20) and ff-material (21). The ceramic glass wool locates on the inside of the soot blower box. The ff-material is floatingly arranged in the soot blower box and is inclined outwards on the inside of the blower box beneath the long hole opening (6).
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