This refers to the options of fitting the blinds inside the frame or mounting the blind to the outside of the frame.
Inside: Check your frame depth
Outside: Check your frame size
PLEASE NOTE: With roller blinds the size you provide us is the bracket to bracket size. The fabric itself is 33mm narrower to allow for the controls.
We recommend outside fitting on all Roman Blinds.
Ideally a Roman blind should be fitted outside and 100mm above the frame. This allows the blind to clear most of the window when in the up position and allows for for more light to enter room. While it depends on the size of the blind most Romans stack to about 250mm when in the up position.