1. Extend your measuring tape across the entire vertical length of the sash. 

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2. Extend your measuring tape across the entire horizontal length of the sash.

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3. Record your measurements, email them to a team member, and you're done!

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4. Please be aware these measurements are only accurate for sash replacements. If the box needs to be changed as well, you should add 135mm to the height and 160mm to the width for an accurate measurement.