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The choice of metal doors are usually dictated by the desire to ensure the safety of office space, housing, preservation of property. It follows the main requirements for the design of the front door - strength, rigidity and vzlomoustoychyvost, that is, the door must be stable in terms of extrusion and disclosure. Therefore, sliding glass doors are almost always equipped with a blade that opens out because the door opening with internal attackers are able to disclose with the jack. The presence of strong steel hinges and pins protyznimnyh also be considered mandatory. In addition to cracking resistance sufficient rigidity necessary to ensure normal operation of the door without the appearance of distortions, deformations and jamming. To do this, the door leaf must have strong internal ribs, preferably made of steel.
