(57) A device (21) for closing an aperture (31) in a partition (30) through which aperture
a plastic pipe (32) passes, when the pipe is subjected to elevated temperature causing
the wall of the pipe to soften, comprises at least one closure member or shutter (25)
for mounting adjacent the wall of the pipe and externally of the pipe; and means (27)
acting on the or each closure member or shutter to urge said member or shutter inwardly
to effect closure of the aperture; the or each closure member or shutter being adapted
(at edge 29) to cut through the pipe when the pipe softens at elevated temperature
and/or the device further comprising a thermal link (26) connected to the or each
closure member or shutter for maintaining the closure member or shutter offset from
the pipe under normal conditions, the thermal link releasing the closure member or
shutter when subject to a temperature exceeding a predetermined value so that said
means causes the closure member(s) or shutter(s) to effect closure of the aperture.
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