| 摘要 |
Partitioning for preventing the spread of fire or smoke through wall apertures created by the burning of plastic pipe. Pre-stressed metal squeezing elements are retained by plastic bolts which melt at about 120 DEG C., releasing the squeezing elements and permitting them to squeeze together the heat-softened plastic pipe. An insert of foamable material may additionally be used to supplement the aperture sealing effect.
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