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Of course, it's not extraordinary, it's also part of the balcony, talk about it before installation, don't wait until it's finished in the dark.
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There should be a turning column, which is separate from the window.
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It depends on the conscience of the engineer's father.
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Generally, it is not counted separately. It is included in the area.
It can't be simply sealed, it is necessary to find out and solve the leakage before it can be sealed, otherwise it will be blocked, and another leak will leak down.
From the point of view of durability and sealing performance, it is better to choose aluminum alloy than plastic steel. It is recommended to use broken bridge aluminum profile windows.
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It is better to use steel materials or alloys, and plastic steel can also be used, but not too well, and steel or alloys can be used for decades.