Which appliance category has a recovery level of 0 inches of mercury both before and after 11/15/93?

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The concept being tested is how recovery vacuum requirements are determined by appliance category and regulatory date. Some categories require you to pull a minimum vacuum (a certain number of inches of mercury) to ensure liquid refrigerant is removed, and those requirements can change after a specified date. For very high pressure appliances, the rule specifies 0 inches of mercury as the recovery level, meaning no minimum vacuum depth is required beyond normal recovery operation. This level remains 0 both before and after the date in question, so this category uniquely matches the given condition. The other categories require a nonzero vacuum depth, so they do not fit the criterion of 0 inches of mercury across both timeframes.