I recently bought pleated blinds and just now realized that they are not wide enough. The instruction says they have to be at least 2 centimeters wider than the window (on each side) they are covering. They are missing 3 centimeters on each side.

What is the reason for that requirement?

The mounting system can be seen here:

Mounting system part 1:

Mounting system part 2:


It's probably not a requirement. It's probably so that less light is shooting past the blind through the gap between it and the window frame.

If it is a requirement it probably has to do with the mounting system, which we have no information about.


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