Measure the calibre of left and right sides of the frame and the calibre in the middle of these sides. Note the smallest measurement.
Likewise, measure the calibres of top and bottom sides of the frame and calibre in the middles of these sides. Note the smallest measurement.
For Roll-Up screens
1. Make the measurement as you would to a reveal fitting.
2. Depending on the height, add the cassette size(s) and the rail size of 60mm.
For Example: The reveal measurement for a Roll-Up door was height: 2000mm and width 900mm. To face fit, The measurment should be recorded as height : 2060mm X width 960mm