Great question John!
The windows on this screened porch are a vertical 4 track system. You can choose to open the windows 25, 50, or 75 percent. Screens are included, making these windows a very versatile option for homeowners who wish to utilize the room on rainy, cloudy, or chilly days. Some clients have even reported that on a mild winter day they can comfortably use their screened porch with a space heater.
Here is more info on screen porch windows, materials, and other design elements to consider.
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Information on windows
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