The overall thickness is the total depth of the entire unit, including:

  1. The first pane of glass
  2. The cavity
  3. The second pane of glass

For example, a unit described as 4/16/4 means:

  • 4mm glass + 16mm cavity + 4mm glass = 24mm overall thickness

For example, a unit described as 4/16/4/16/4 means:

  • 4mm glass + 16mm cavity + 4mm glass + 16mm cavity + 4mm glass = 44mm overall thickness