Another reason for four panels
The four panel curtain is a throwback to pre-A/C Airstreams.
If you choose not to use the A/C, you open the middle section of the panoramic window to the first (smallest) opening, turn on the Fantastic fan to exhaust, and close the curtains. Then you adjust the amount of cool, incoming breeze by spreading apart the two outer curtain sections from the middle section. This works extremely well if your bed or beds are under the window, as each opening can be adjusted to lessen or increase the breeze for the “hot” or “cold” sleeper. And the closed curtain over the opened middle window maintains visual privacy at night.
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