Secondary glazed windows
Tony Bryer wrote:
On Thu, 19 Apr 2007 10:36:09 +0100 The Natural Philosopher wrote :
And the airgap? Now add that.. If the unit is sealed reasonably well, a
4-6" airgap is going to be a LOT better than a double glazed unit.
No, because once the gap gets beyond a certain figure (around 16-20mm)
convection currents within the gap cancel out the effect of the extra
space.
16-20mm is more than most DG units have though.
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