There is no criterion of design and references to the structural design of blast resistant doors, so lack of security or being too conservative may appear in the design.

抗爆门结构设计尚无现成设计标准、规范可循，设计结果可能会出现安全性不足或过于保守等情况。

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Several safety features have been included in the design, such as separate staircases for firefighters and blast-resistant glaze on the lobby glass.

BBC: NEWS | Americas | Freedom Tower plan for WTC site