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

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The key idea is the level of vacuum the recovery equipment must reach to consider refrigerant adequately recovered. For high‑pressure appliances or isolated components that normally contain more than 200 pounds of refrigerant, the standard after November 15, 1993 required achieving a vacuum of 15 inches of mercury. This deeper vacuum ensures most of the refrigerant is removed from the system before disposal or service, reducing the chance of venting to the atmosphere.

Compare to the other options: shallower vacuums like 0, 4, or 10 inches of mercury would leave more refrigerant behind in the circuit, which isn’t acceptable for large high‑pressure charges under the post‑1993 rule. A 15 inches of mercury vacuum strikes the balance of being a practical, achievable target that effectively evacuates large systems.