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The recommended number of outdoor air changes in a decontamination area is typically set to ensure adequate ventilation and minimize the concentration of airborne contaminants. A standard guideline suggests that 10 air changes per hour is considered effective to maintain a safe environment for staff and to adequately remove any potential airborne pathogens from the space.

This recommendation is based on infection control standards and practices, particularly in healthcare facilities where decontamination occurs. The ventilation rates facilitate improved air quality, reducing the risk of inhalation of harmful particles or pathogens that might be present during the reprocessing of medical devices.

Lower numbers of air changes might not sufficiently control the microbial load in the environment, while higher rates, although beneficial for air quality, may not be practical or necessary in typical decontamination settings. Therefore, settling on 10 air changes strikes a balance between safety and feasibility in decontamination areas.