They have been in use in Sweden since I visited there in 1966. But I
have never under stood why they have never taken off in the UK As
you say "I suspect they are expensive!"
The ones I saw, you could, lower and rises, open and close, all
They're commonly found in offices here in internal windows
in partition walls. However, these aren't sealed units.
I wonder how you get the moving parts through the seals?
That reminds me, I drove past a large building (flats/appartments)
somewhere in the last couple of weeks (can't recall where
it was, but somewhere I hadn't been before). I did a double-
take when I looked at the windows. They were replacement
windows in an older building, but they looked like that had
lots of random white tape on the glass, all over the building.
Then I realised what it was -- the sealed units had been made
with white plastic criss-cross pieces to look like smaller
panes, but these had all fallen to pieces and dropped into
a random jumble at the bottom of the unit! There must have
been hundreds of affected windows -- damn expensive cock-up
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