| 摘要 |
<p>A fire stop for sealing the space between a flue pipe and the periphery of an opening in a floor through which the flue pipe passes comprises a collar having a bore for sealable engagement with the flue pipe. Portion of the outer periphery of the collar tapers in an axial direction for sealing engagement with a correspondingly tapered periphery of the opening. The collar is formed from two collar segments which are pre-fabricated from a fibre reinforced cementitious material which is selected so that the density of the material of the collar is similar to the density of the floor. Each segment extends into the space above the floor. A heating dissipating fin extends radially from the outer periphery of the collar above the opening. In the event of a fire in the flue the collar rises on its taper maintaining sealing engagement with the periphery of the opening and dissipating heat into the heat sink formed by the floor and into the ambient air above the floor.</p> |
