Find the Top Track: Look for the U-shaped channel under the window’s meeting rail where the two parts come together. This is where the screen will slide in.
Locate the Bottom Lip: Identify the lip directly below the top track where the bottom of the screen will sit.
Insert the Tape Measure: Place the tape measure into the top track as far as it will go. Hold it straight down.
Measure the Height: Measure from the top of the track to about 1/16" to 1/8" above the bottom lip. Round this measurement to the nearest 1/16". Make sure the tape measure is fully in the track for an accurate height measurement.
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