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Measure the height. <br />Inside opening height is measured from the inside face <br />of the head jamb to the highest point of the sill where <br />inside of bottom sash meets sill. (Do not measure from <br />sill to head parting stop.) Measure at a minimum of <br />three different locations: left, center and right. Round <br />odd measurements down to the nearest 1/16”. Record <br />the smallest measurement. See Fig 11 and 12. <br /> Measure the width. <br />For inside opening width, measure from the inside face <br />of jamb to jamb. To insure accurate measuring, the <br />existing sash and jambliners will need to be removed. <br />(Do not measure from parting stops or inside stops.) <br />Measure at a minimum of three different locations: top, <br />middle and bottom. Round odd measurements down <br />to the nearest 1/16”. Record the smallest measurement. <br />See Fig 8 and 10. <br /> Measure the width of the exterior stop from the inside <br />opening to the edge of the stop. If the width exceeds <br />9/16”, modification to the exterior stop or an exterior <br />installation may be necessary. See Fig 10. <br />Measure the sill angle. <br />Measure the sill angle with either an angle <br />measurement tool, found at most hardware retailers, <br />or with the template provided in this flyer. Lincoln <br />Fit units are designed to fit openings with a sill angle <br />between 8° and 14°. If the sill angle is greater than <br />14° the sill weather-strip may not make contact with <br />the sill. Alternate weather-stripping and/or additional <br />sealant (by others) may be required. Sill angles closer <br />to 8° may require the sill weather-strip to be removed <br />and a backer rod and sealant used at the sill area. Sill <br />angles less than 8° should be ordered with our factory <br />applied flat sill trim option. See Fig 14 and 15. <br />Lincoln Fit Measuring StepsMeasurIng Your WI ndoWs <br />Lincoln Fit Double Hung Insert Window <br />Fig. 12Existing Window Frame - Side View <br />Fig. 10Existing Window Frame - Top View <br />Fig. 11Height - Three Locations <br />Fig. 8Width - Three Locations <br />0° <br />9° <br />8° <br />7° <br />2° <br />4° <br />6° <br />5° <br />1° <br />3° <br />Fig. 15Existing Window Frame - Side ViewFig. 14Existing Window Frame - Side View