What do the "surface numbers" mean as applied to a dual pane windows?

If you noticed strange surface numbers being shown on our Recommended Film Calculator and it appears they might apply to your application, an explanation of what these numbers represent are explained as follows: Used in the glass industry, these surface numbers are a reference to a glass's surface position starting from the exterior of a building. Surface #1 is the surface on the exterior of a building that is directly exposed to the outside elements. In a dual pane, there are 4 surfaces.

Surface #4 is the interior room-side surface of the inner pane. Surface #3 is the outer surface of the inner pane. Surface #2 is the inner surface of the outer pane.

And surface #1 is the outermost surface of the outer pane. More.

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