Boiler flue

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hi,

I'm having my old boiler decommissioned in a couple of weeks as the location of the boiler is changing.
In the meantime, I want to knock out a rear wall of the house to open into the rear extension. Should I be concerned about the fumes coming back to the house over these 2 weeks?

The flue terminates into the downstairs extension and has a 3.5 metre opening into the garden straight ahead of it.

Hope that makes sense.
 
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The boiler was on the back wall of the original house. Flue popped out of the wall into the garden.
I have now erected a double storey rear extension. The ground floor has a 3.5m opening for a bifold. The door isn't in yet which means that the fumes are escaping into the open. To be clear, the extension is not habitable yet. The structure is ready.

in 2 weeks the boiler will be decommissioned and new boiler will be running in a different part of the house.

I have an opportunity to know I through upstairs into the new first flow extension but am concerned that the fumes from the current boiler will come through to the house once it's opened up upstairs. Or is this not an issue since the ground floor has the 3.5 metre opening?
 
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:eek::eek::eek:

The boiler should be turned off immediately and not used again, it's potentially dangerous as it is and you certainly shouldn't be considering opening up your house into the extension. 3.5m opening or not, you've now placed the flue inside a building and that is far from safe
 
Easy...
The extension is completely closed off from the house at the moment and as I said there is a 3.5 x 2.5 opening in front of it.

Do I really need to rush to the off switch???
 
And what happens if there's a buildup of Carbon Monoxide (CO) in there because the flue gases aren't getting away as you expect, and someone goes in and breathes it? Or the CO enters your home through trickle vents in windows/air bricks etc etc. If the situation you describe was found on a gas safety inspection, the person doing the inspection would be expected to disable the boiler. Sorry, but it just can't be considered to be safe as it is
 
I appreciate your point but how can the gases not be escaping when there is a 3.5 metre by 2.5 metre hole?
 
I appreciate your point but how can the gases not be escaping when there is a 3.5 metre by 2.5 metre hole?
Some will be, but you can't guarantee that everything will be going out, and it only takes a bit to remain to trigger a chain reaction of increasing CO levels.

Just turn it off
 

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