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Fig. 1Squareness <br />Precise measurements are key for proper installation of a replacement <br />window. If you plan to take your own measurements, please make <br />sure that every window is measured (even though they may appear <br />to be exactly the same size) and provide accurate measurements <br />when placing your order. Measurement adjustments for squaring, <br />shimming and leveling will be applied during manufacturing. For <br />measuring full-frame replacement windows and patio doors, Lincoln <br />recommends using a trained professional. <br />Before you begin measuring, the condition of the existing frame must <br />be inspected. <br />InspectIng Your WI ndoWs <br />All Replacement Product <br />Check for soundness. <br />Check the frame and jamb for damage, rot or deterioration and repair or replace <br />where necessary. <br />Check the squareness. <br />Measure diagonally from corner to corner. <br />Double Hung Replacement Kit: If the sizes differ greater than 1/4”, the window frame <br />is too out of square to use a replacement kit. <br />Lincoln Fit: If the sizes differ greater than 1/4”, you will have to downsize the unit <br />accordingly in order to be able to square the new unit in the opening. See Fig 1. <br />Check the jamb pocket. <br />The measurement of the jamb pocket between the interior and exterior stops must <br />be at least 3-5/16”. If depth of pocket is less than 3-5/16” or greater than 3-3/8”, <br />modification of the pocket may be necessary. See Fig 2. <br />NOTE: If your existing window frame is not sound or is greatly out-of-square, you will <br />most likely need a full-frame replacement. <br />Measuring Instructions <br />Fig. 2Existing Window Frame - Top View