Before installation, the construction shall be carried out according to the plan, and the varieties, standards, opening direction and support pieces of doors and windows shall be checked.
The national standard of floor spring door is that the first-class product is opened ≥ 300000 times (actually the minimum standard of qualified products), the high-quality product is opened ≥ 500000 times, and the European standard is the minimum 500000 times.
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