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Flue fire stops

Joined
10 Feb 2007
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Location
Cumbria
Country
United Kingdom
Why are twin wall flue fire stops vented metal instead of close fitting fire board? Surely fire would be drawn through this area of the ceiling?
Cheers
 
I thought that the vents are so that air can circulate within enclosed spaces of the twin walled flue (IE when boxing in in a bedroom), or within the enclosed space between ceiling and floow, but that the vents are designed to close up if excessive heat forms (like from a chimney fire.)
Having said that, there seems to be a mix of vented and non-vented fire stops about, depending on what make of flue system you use.
All a bit of a mine field if you ask me.... :!:
 

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