What is the minimum letter size for required signs in a refrigeration plant containing more than 45 kg of refrigerant?

In a refrigeration plant containing more than 45 kg of refrigerant, the minimum letter size for required signs is indeed 13 mm. This standard is set to ensure that safety and informational signage is legible from a reasonable distance, which is crucial in the event of an emergency or when personnel need to quickly identify important operational and safety instructions.

Signs with inadequate letter sizes may not be easily readable, leading to potential risks during operations or emergencies. The regulation associated with this requirement typically outlines specifications for visibility, ensuring that all individuals in the vicinity can easily notice and comprehend critical information, contributing to a safer working environment.

Larger letter sizes, while they may offer better readability, are not always necessary according to regulations, which is why options like 15 mm and 20 mm may not be mandated for general signage in this context. The specification of 13 mm strikes a balance between clear communication and practical constraints of signage design in refrigeration facilities.