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If it's not visible then it's not damaged.
Thats what the RGI thought when the flue in a void killed someone!
If its not visible then you cannot know its condition.
Sorry,just to make a point in relation to this.
The big difference being, the flue in voids is due to CO having no smell.
Gas has a smell,it takes very little over a short period for most people to realise something isn't quite right.