What type of project is this?
These are sometimes called "Solar Screens". They can be black or brown or even white, but they are a tightly woven mesh that covers both sides of the window usually to help reduce the amount of sunlight that can get through the window. They are not usually standard on a house, they would be purchased separately in most cases.
If all of your windows are storm-type windows, then you will only fill out this area. We count storm windows separate from regular "pane counts".
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