I am decorating a bedroom in a 1930 house. There is no fire, and I
don't THINK there ever has been. It has an air brick to the outside, in
this day and age with central heating is it necessary, or desirable? If
I get rid of it am I best leaving the air brick in the outer wall or
getting rid of that too?
TIA

Broadback formulated the question :
I am decorating a bedroom in a 1930 house. There is no fire, and I don't
THINK there ever has been. It has an air brick to the outside, in this day
and age with central heating is it necessary, or desirable? If I get rid of
it am I best leaving the air brick in the outer wall or getting rid of that
too?

We originally had four of these.

Ours were all (but one) bricked up on the inside during a renovation by
a builder nearly twenty years ago. The outer wall vents were left in
place, though there would be little point to them being there, once the
inner is closed up.

The one which was left in a bathroom, I sealed the cavity gap so all
air went straight out (no condensation in the cavity) and installed an
extract fan.

I think the point to aim for is not less ventilation, but more
controllable ventilation.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.org