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Old 05-09-13, 10:24 PM   #13
nitro-nige
Lurking Renovator
 
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This site
http://www.pilkington.com/~/media/Pi...ltUValues.ashx
has a rather interesting table showing the U value for different air gaps and glass coatings.

I would expect at some point the gap would become too big and you would create enough space for air currents to exist within the IGU.
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