What is the required level of evacuation for low pressure equipment using recovery or recycling equipment manufactured after November 15, 1993?

The required level of evacuation for low pressure equipment using recovery or recycling equipment manufactured after November 15, 1993, is 25 mm Hg absolute. This standard is established to ensure that all refrigerant is removed from the system to prevent the release of ozone-depleting substances into the atmosphere and to ensure the system can be properly repaired or decommissioned without the risk of moisture contamination.

Achieving a vacuum level of 25 mm Hg absolute indicates that a significant amount of air and moisture has been evacuated, which is particularly important in low-pressure systems that can retain substances that cause harm. This level is especially relevant in handling certain refrigerants that may not respond well to higher pressures or that might contaminate if not adequately evacuated.

Other levels provided in the choices, while having some significance, do not align with the established requirement for low-pressure systems and therefore stand as less optimal or incorrect in this context.