Inert gas: a term used for the gases that are used in insulated pane windows, Argon or Krypton, which have a higher insulating capability than air.
I.G. Unit: a window with an insulating air space between panes.
Impact resistant glass: glass that is laminated like automobile glass to resist breakage and possible injury due to impact. There are different grades of impact resistant glass.
Infiltration: the flow of air through cracks or loose fitting window components.
Insulating glass: multi-layer, hermetically sealed glass, usually filled with Argon or Krypton for superior insulating properties.
Insulating value, or U-factor: a measure of the heat transfer of a window (excluding solar) - the lower the U-factor, the better the insulating properties of the window.
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