when a sealed unit is made whats in the cavity? is it just trapped air or do they replace it with some gas or something? hope this isnt a daft question!
Depends on the unit - normally its just air but you can specify gases like argon which give a better insulation value
i always thought it was a vacuum !! - just looked it up and hallbeck is right. Mostly air but sometimes they use argon or krypton for better thermal & acoustic properties
You are all correct. Air, argon and sometimes other gases, OR vacuum....... Vacuum double glazing (Evacuated windows) Working much in the same way as a Thermos flask, the "fill" strategy with the lowest conductance is the use of vacuum between low-e coatings. Only a very small distance between the glass panes is necessary, but the long-term integrity of seals and the structural stability of the unit (due to pressure differences) are difficult to master in a cost-effective manner. Mr HandyAndy - Really
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