Freight elevator car sides above 6 feet must be made of which material?

Freight elevator car sides above 6 feet must be constructed of solid metal to ensure structural integrity and safety during operation. Solid metal provides strength and durability necessary to withstand the stresses and loads that freight elevators typically experience. Metal construction also offers better protection for both the cargo being transported and the users of the elevator, as it reduces the risk of collapse or failure compared to other materials.

Using materials like wood, glass, or plastic would not meet the rigorous safety and durability standards required for freight elevators. Wood can warp or break under heavy loads, glass poses a significant risk of shattering and injury, and plastic may not offer the necessary strength or resistance to impact and wear over time. Therefore, solid metal is the preferred and mandated choice for the sides of freight elevator cars above six feet in height.