Gemini Quadrat FB SF is a variant of Gemini Quadrat FB with a slanted rebate. This system is known as “Schrägfalzsystem” and is popularized by the manufactures of newest types of cutterheads. It’s characterized by diagonal rebate of the wooden window frame, with an inclination of 7 to 15 degrees instead of using central TPE frame gasket. Window construction water drainage is done by slanted part of the wooden framework, rather than as a traditional solution by using frame gasket.
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