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Wood aluminum windows in use, the action should be light, push and pull naturally; If you find it difficult, don't pull or push hard, but eliminate the fault first. Ash accumulation and deformation are the main reasons for the difficulty of pushing and pulling aluminum clad wood doors and windows. Keep the door frame clean, especially the push-pull groove. The dust accumulated in the groove and the door sealing top can be sucked with a vacuum cleaner.
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