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  • How to improve the key performance of PVC windows and doors

    How to improve the key performance of PVC windows and doors

    2021-11-26

    The air-tightness of doors and windows refers to the length of opening joint of doors and windows or the air permeability per unit area. It tests the ability of doors and windows to prevent air penetration when closed. The air tightness of doors and windows has a great impact on the heat loss. Read More