In message , nightjar
writes
On 10/01/2021 20:16, David wrote:
Just a thought about the row of 1930s houses here (and others seen in the
past).
They seem to be generally built with air vent bricks near the
ceiling in
upstairs bedrooms
I assume that this was for ventilation because most rooms had coal
fires.
Again I assume that most of these have been blocked up over the
years.
Certainly no trace of any inside our house.
I assume previous owners blocked them up....

My 1930s house has quite a number of air bricks around it. They
ventilate the cavity wall, rather than the rooms.

All this got me thinking about ventilation.
With double glazing and draught proofing round doors and blocking up (or
not installing) fireplaces modern houses seem to have minimal ventilation...

Which is why the building regs now require windows to have trickle
vents in new builds and extensions.
Our Victorian much modified timber frame farmhouse did not appear to
have any original air inlets for the cooking range or the fire openings
in each room. Late '30's doors/windows were never a good fit but the
bedroom fire openings had been closed off and sliding vents fitted.
(point for the O/P; chimney condensation issues).



--
Tim Lamb