The sizes entered here are overall frame sizes. We recommend deducting 10mm for clearance

A - Door width
Enter door width including frame

B - Door height
Enter door height including existing sill unless it is NOT going to be replaced, I.E. A concrete sill is present

C - 2x flag width
Enter the width of one flag window; they will both be supplied at the same size

D - 2x flag height
Enter the height of a flag window; they will both be supplied at the same size