| 摘要 |
A window frame incorporating a sliding sash, the frame providing increased water resistance by incorporating an integral J-rail return, the return portion of which has a double wall to provide a depending trough at the bottom of the frame with a wall forming a chamber including the trough, openings from the bottom of the frame into the chamber and from the bottom of the trough to the exterior to provide increased dam height against water backing up and spilling over the interior sill of the frame.
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