Tool: a steel tape measure

For Inside Fit: (window frame depth > 50mm)

  1. Width: measure it in 3 locations - top, middle and bottom and use the smallest
  2. Drop: measure it in 3 locations - left, middle and right and use the smallest

For Outside Fit: (window frame depth < 50mm)

  1. measure the width and add 50mm
  2. measure the exact drop and add 100mm


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