"Metal gratings are functional elements, industrially manufactured, for which the following must be observed: - Dimensional tolerances of the gratings correspond to the attached data sheet (according to RAL-GZ 638). These tolerances can be guaranteed up to an area of 2 m² and/or a maximum length of the side of 2,000 mm. Additionally, these tolerances are no longer valid in accordance with RAL-GZ 638. - The supporting bars of the gratings (top bars) must be supported at both ends on a substructure with at least 25 mm. This is the only way to dissipate the forces that occur. - Metal gratings can be offered in hot-dip galvanized steel or stainless steel. The following must be observed, especially in the case of hot-dip galvanized steel (according to DIN EN ISO 1461): (The evaluation is made from a distance of 1 m with the naked eye) o Small defects, where the zinc absorption is not sufficiently present, are treated again with suitable agents (e.g., zinc spray). This subsequent remediation is usually visible. This does not constitute a defect of the product. o Zinc flakes or small zinc peaks and inclusions on the zinc surface may be present between the mesh. Also, small surface irregularities of the zinc may appear. All these do not constitute a defect of the product. o Due to external influences, white rust may form on the grating surface. This can be easily removed, for example, with a copper brush. This does not constitute a defect of the product. o Hot-dip galvanized items are initially shiny silver and become matte gray after a few weeks. This is a physical process and does not constitute a defect of the product." - We recommend not walking barefoot on a grating. Among other reasons, because, in general, steel components can heat up significantly when exposed to sunlight and, therefore, pose a risk of injury. Additionally, welding splatters and zinc peaks may be present.