Blocks air leak from vertical (up and down) gap of my sliding glass door. The vertical air gap is between the movable door frame and the fixed (non-moving) glass frame. Installed and cut the strip vertically on the clean indoor side of the movable door frame, from top to bottom. Door still slides open/closed easily due to flexibility of this weatherstrip. I live in Florida and my AC cooling requirement dropped by about 10% after installing this weatherstrip. I live by the beach and my 1997 aluminum door frame is warped from 20+ years of heat/humidity/salt air/corrosion.
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