Socket inside disused chimney breast

[ebee]

It is not a matter of law or regulation but physics. Google it.

Agreed - one must consider the effects of ventilating against those of not ventilating and then decide what is required in such instances. Not only the physical results but also any rules , authority or law too, whether implicit or implied .
EFLI has pointed out something that should be given due consideration, quite correctly.

 

[FrodoOne]

It is not a matter of law or regulation but physics. Google it.

As usual, your comments are "interesting".
However, you do tend not to give references!

If you would be so kind as to give "references" to the "physics" to which you referred,
it would be of interest and "helpful" - to myself and others.

While I have found (Googled) this "reference"
(https://paragontools.com.au/unused-... unused chimney,with a ventilated metal sheet. )
no doubt there are others.

So, is
"Capping" better than "Blocking"
should either be done - or both?

In the words of a local (in)famous Politician.
"Please Explain"!