For other high pressure appliance or isolated component normally containing less than 200 pounds of refrigerant, what was the required recovery level before November 15, 1993?

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The main idea here is understanding how recovery effectiveness was measured in the EPA 608 program, using inches of mercury as a vacuum indication. For high‑pressure appliances or isolated components that normally contained less than 200 pounds of refrigerant, the standard before November 15, 1993 required recovering refrigerant until the system reached a vacuum of 4 inches of mercury. This level provided a practical, achievable target to remove most of the refrigerant without demanding an impractical deep vacuum.

In other words, you would run the recovery equipment until the gauge showed about 4 inches of vacuum. Values like 0 inches (no vacuum) would imply not sufficiently recovered, while larger vacuum readings (10 or 15 inches) would go beyond the historical requirement for that category. So 4 inches of mercury is the correct historical recovery level.