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

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When recovering refrigerant from a high‑pressure appliance or isolated component, the rule is to evacuate the system to a specific vacuum level so that most of the refrigerant can be drawn out rather than vented. For large systems—those normally containing more than 200 pounds of refrigerant—the pre-1993 requirement was to achieve a vacuum of 4 inches of mercury before completing the recovery. This shallow vacuum ensured that enough refrigerant was removed during the recovery process without demanding a deeper, more time-consuming evacuation.

In this context, 4 inches of mercury represents the standard depth of evacuation mandated before November 15, 1993, for these large appliances. Later regulatory changes increased the required vacuum to deeper levels, but that earlier date is associated with the 4 inHg requirement.