Wincore Windows & Doors
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Wincore Windows and Doors
Wincore® Windows & Doors
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Wincore® Glossary

Please select a letter to begin browsing the Wincore® Glossary.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
You are now viewing section R
Rail
The horizontal sections of a sash.
Rough Opening
The framed opening in a wall that the new window or door unit will be installed into.
R-value
The measurement of a window’s resistance to heat flow.


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