Inside or outside a recess?
If any of the following are true then the blind should be positioned outside the recess:
- The window recess is less than 4cm.
- The window opens inwards.
- The recess is not square (or wonky to use a non technical term); the recess width varies by more than 2cm when measured at different points OR recess height varies by more than 2cm when measured at different points OR diagonal distances differs by more than 2cm (see example diagram below where A is not the same as B).