Do you have any figures as to how much air can be forced, by wind
pressure alone, through a pair of, say, 3mm holes, especially if not
aligned across the two panes?
Do you have any figures for how much air can be forced, by wind pressure
alone, through the seals round the glass, between inner and outer
frames, round hinges, between wall and frame, etc., in a fairly ordinary
Anticipating your answer, I'll say "Me neither", but I'd be surprised if
the glass holes allowed anything like as much as the rest of the
It's not going to matter too much if they're aligned or not. Wind
pressure will force air into the gap between the panes, which will then
be forced out into the room.
Really? When we moved here, there'd fairly recently been extension
work. All the new windows were wooden double-glazed, so we thought,
that's OK. Wrong. They were all extremely poorly sealed, and cold air
came round the edges of all of them (the DG units themselves were OK).
So we had the whole lot replaced within six months. Result? One or two
rooms are still getting cold  and I'm taking steps to fix that. But
in the main, as the new windows have rubber seals and do not leak air,
it's a major improvement.
 E.g. the kitchen. But I think there are holes to the outside in the
outer wall, and cracks in the inner wall. So, strong wind and same
result. That will get fixed when we redo the kitchen, as these issues
are behind kitchen units.
"... you must remember that if you're trying to propagate a creed of
poverty, gentleness and tolerance, you need a very rich, powerful,
I didn't suggest for one moment that fully sealed panels wouldn't be
better. And even that argon filling might not be a good idea. Just that
the difference that a small hole will make is probably not that great.
My house used to have metal Crittall windows, set in wood, with rather
Heath Robinson sliding secondary glazing. The gap was around 2.5 inches.
Although the system was sort-of draft proof, it certainly wasn't
airtight enough to stop flies getting in between. We eventually took the
plunge and got modern double glazing, but I don't reckon it's anyway
near as effective as the old stuff.
Then I ask again why they are made sealed - and more expensive varieties
use other than plain air inside.
Seems a lot of effort to go to if it makes no difference.
But then I'd not expect you to know the facts about anything.
*Gun Control: Use both hands.
Dave Plowman firstname.lastname@example.org London SW
I think you are nit picking. All double glazing units have some degree
of breathing. That's why silica gel is used in the seals. You can't get
a gas tight soft seal that's going to last 25years on edges up to 8M
long. Filling with other gases gives a short term improvement, but units
will mist when the seals break down. A small hole will have very little
effect on a large panel as the heat exchange relies on air circulation
within the panel, not from outside air being introduced.
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