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Originally Posted by MovedGoalPosts
Most modern balanced flue boilers are room sealed. Fresh air for combustion is pulled in through one channel of the flue, whilst exhast gasses are expelled through the other channel of the flue.
If the boiler isn't room sealed, i.e. it is open to the room itself (such that you can stick a taper or other light in), you need to ensure the room itself has proper permanent ventilation (an air grille that cannot be blocked - an openable window is not enough) otherwise you run a risk of carbon monoxide poisoning.
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How does that work when I've got an aga ....'cos I can take the little glass window off and light it with a taper
