Sometimes in sales presentations, it is fun to illustrate to a customer what a perfect window might look like from a thermal performance standpoint.  To illustrate this point, many sales team members will use this double-pane window filled with insulation to bring that point to life.  The standard window is constructed of 1/8" glass with a 1/2" spacer.  Other options may be available.  With the protective white vinyl wrap on the perimeter, the resulting window dimensions are 7.2 x 7.2 x 0.95 inches.