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The optimal humidity level for the preparation and disinfection area is essential for ensuring the effectiveness of the cleaning and disinfecting processes for endoscopes. A humidity level of 20-60% is generally recommended because it strikes a balance that helps in preventing the growth of mold and bacteria while also minimizing damage to sensitive medical instruments.

At this humidity level, the moisture in the air helps to prevent the buildup of static electricity, which can interfere with electronic components of endoscopes. Additionally, higher humidity can enhance the penetration of disinfectants, enabling them to work more effectively against microorganisms. Too low humidity (like 10-20%) can lead to static build-up and insufficient moisture to facilitate cleaning, while too high humidity (like 60-80%) increases the risk of microbial growth and can compromise the integrity of the equipment. Therefore, maintaining a humidity level between 20-60% is critical for a safe and effective environment for endoscope reprocessing.