Measure between the jambs of the existing opening at the top and bottom., moving the sash as necessary. Order based on smallest measurement.
Measure from the high point of the sill to the top of the casing of the existing opening on both the left and right sides. Order based on smallest measurement.
Tip: Measure in three different places along the frame, and choose the smallest measurement. Then deduct ¼ inch from the width and height before ordering.
Note: All windows are manufactured with no deductions they are manufactured exactly as ordered.
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