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Photo: Courtesy of Deceuninck
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Building Products: Quadromania

Genius Window, by Deceuninck
What's the point of a window with mirror-image double-pane sashes, one that swings out and one that swings in? How about an insulating value of R-14, seven times more than a standard double-glazed window. It's like putting up a batt of insulation. Except you can see through it.

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