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- Q4769749 subject Q8460051.
- Q4769749 subject Q8718174.
- Q4769749 abstract "The Annulus, or annular space, is the space between a penetrant and whatever surrounds it, such as the sides of an opening or a sleeve, as the case may be.Sometimes an annulus can be "offset", meaning that the penetrant is not centred. If the firestop was tested only to a perfectly centred opening, an offset may disqualify it for use in the field.In practical terms, an offset penetrant or annulus may very well present an added degree of difficulty for passing the fire test. A metallic sleeve as well as a metallic penetrant will conduct heat through the firestop. Insulation on the bottom of floor systems or in the middle of wall systems, as is the case with caulking or paint based (soft) systems, will encourage more heat to travel through the sleeve and the penetrant, which can put more stress on the seal on the unexposed side. In the case of a thin (below 4") firestop mortar, there is also more potential hazard from tight annular spacing because metal expands during the fire, thus squeezing the firestop - only to rapidly shrink when hit with the hose-stream test, which can let water through, thus failing the H rating in Canada or the entire rating in the US, where hose-stream testing is mandatory. Such a failure may no longer be visible once the test assembly has reached ambient temperatures again.For all these considerations, the annular space is a critical aspect of field approvals.".
- Q4769749 thumbnail Sprinkler_branch_penetration.jpg?width=300.
- Q4769749 wikiPageExternalLink C-AJ-1557_021207.pdf.
- Q4769749 wikiPageExternalLink 6820382.html.
- Q4769749 wikiPageWikiLink Q11426.
- Q4769749 wikiPageWikiLink Q189566.
- Q4769749 wikiPageWikiLink Q4206650.
- Q4769749 wikiPageWikiLink Q44432.
- Q4769749 wikiPageWikiLink Q659925.
- Q4769749 wikiPageWikiLink Q7889370.
- Q4769749 wikiPageWikiLink Q8460051.
- Q4769749 wikiPageWikiLink Q8718174.
- Q4769749 wikiPageWikiLink Q898221.
- Q4769749 comment "The Annulus, or annular space, is the space between a penetrant and whatever surrounds it, such as the sides of an opening or a sleeve, as the case may be.Sometimes an annulus can be "offset", meaning that the penetrant is not centred. If the firestop was tested only to a perfectly centred opening, an offset may disqualify it for use in the field.In practical terms, an offset penetrant or annulus may very well present an added degree of difficulty for passing the fire test.".
- Q4769749 label "Annulus (firestop)".
- Q4769749 depiction Sprinkler_branch_penetration.jpg.