ᐅ Window size for external venetian blinds

Since I am the blinds guy here...
Which type of blind? 80mm (3 inches) slats with rolled edges?
The stack height depends on the slat width and whether it is a flat slat or a rolled-edge slat.

THANK YOU! We would choose the option that takes up the least space in order to have the largest possible windows! What is your recommendation for this? THANK YOU!

60/80 flat slats, but not stable in wind/storm conditions

You might want to take a look at the 90-degree Z-profile; it is flat and sturdy.

Thanks for the tips! But how tall is the shutter box now? And: How tall can the windows be with a room height of 2.75 m (9 ft) and a typical floor construction?

THANK YOU!

Depending on the slat size you choose. Between 15cm (6 inches) and 25cm (10 inches)