For non-HCFC22 more than 200 lbs of refrigerant, what is the required recovery level before November 15, 1993?

For non-HCFC22 refrigerants, the required recovery level before November 15, 1993, is 15 inches of vacuum. This standard was put in place to ensure that refrigerants are not released into the atmosphere during the service and recovery processes, thereby promoting environmental protection and safety.

Applying a recovery level of 15 inches of mercury ensures that any refrigerant recovered is collected efficiently and minimizes atmospheric emissions. This level was established recognizing the necessity to balance effective recovery methods with practical operational capabilities in the field at that time. Proper recovery equipment would allow technicians to achieve this vacuum level, ensuring compliance with regulations aimed at the protection of the ozone layer and the environment.

While other options denote varying levels of vacuum, the correct answer aligns with the established regulatory requirement for refrigerant recovery prior to the specified date.