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What do the Xs and Os refer to in window language?

April 26, 2017Language refer window

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What do the Xs and Os refer to in window language?

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An “X” is an operable panel and an “O” is a fixed panel as viewed from the exterior of the home. For instance, an “XO” window would be a two-panel, horizontal sliding window with the operable panel on the left from the exterior side.