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characteristic: 1. frame of 88 series has the design of four-chamber structure. both frame and sash have the design of independent draining-chamber.
2. thickness of window profiles have two specifications-2.0mm、2.2mm, which apply to different customers’ choices.
3. thickness of window profiles is 2.5mm, which conforms to the related standard.
4. by th use of different jointers, it can make an achievement of transformation among any angles, such as 90 degrees or 180 degrees.
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