Alphabetical designators will be placed on the MHE contrasting colors in what size block letters?

Alphabetical designators are required to be displayed on Material Handling Equipment (MHE) in contrasting colors to ensure visibility and legibility. The specific size of the block letters that are mandated for these designators is 3 inches. This size is large enough to be easily read from a reasonable distance, which is critical for safety and operational efficiency in a working environment where MHE is used. Visibility of identification markings is essential in distinguishing between different types or functions of equipment, especially in busy operational settings where quick recognition can prevent accidents and improve workflow. Thus, the requirement for 3-inch letters balances readability with practicality in using the equipment effectively.