Metal doors are used for which properties?

• A. For aesthetics only
• B. For security, fire resistance, rot resistance, blast resistance, wind load resistance; can be steel or hollow metal, or aluminum (typically glazed)
• C. For cost reduction
• D. For weight reduction

Answer: (B)

Metal doors are chosen for protection and performance, not just looks. They provide security through strong construction and hardware, and many are designed as fire-rated assemblies to slow or stop fire and smoke. They resist decay and rot because metal doesn’t deteriorate from moisture like wood can, making them reliable in humid or exposed environments. In security‑critical or high‑risk areas, metal doors can be engineered for blast resistance, and for exterior or high‑wind applications they’re built to withstand significant wind loads when properly framed and anchored.

Steel or hollow metal doors offer high strength and durability, while aluminum doors are lighter and often used when glazing is desired to bring light through while maintaining protection. In aluminum versions, glass panels are typically included (and can be fire‑rated glass if required) to balance visibility with safety.

So, the best answer reflects those protective and performance properties: security, fire resistance, rot resistance, blast resistance, and wind load resistance, with material choices that support those functions.