OLD Measurement Instructions

Measure Top Width from Mark to Right Side

By Doug, the Screen Guy | Published October 22, 2010 | Full size is 1808 × 1357 pixels

Measure Top Width of Opening Mark Bottom Width 20" from Left Side

Now measure out from the right side to your mark and record the measurement in inches and sixteenths on your worksheet.

Add that amount to 20 inches. This is your top width measurement.

In the example shown here the measurement from the right side to the mark is 16 3/8 inches. That added to 20, 36 3/8 inches, is the top width measurement for this door.

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