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characteristic: 1.it is the four-chamber structure design.
2. it can make inside casement window and outside casement door.
3. the design of 2.8mm thickness and four-chamber structure applies to the environment of high requirement of heat preservation and thermal insulation and sound insulation.
4. it can be assembled by the single, double and triple glass.
5. it is added the design of dripping eave to pg6003, which make it elegant meanwhile improve the performance of drop of water leakage.
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