Core (Universal)第 9 / 240 题
As of January 1, 2020, what happened to R-22 (HCFC-22) in the United States?
a.It was required in all new residential air conditioners
b.It was reclassified as a natural refrigerant
c.It became legal to vent it freely to the atmosphere
d.Its production and import were banned; only recovered supply remains
解析
Beginning January 1, 2020, it became illegal to produce or import R-22 in the United States, so servicing older R-22 equipment now depends on recovered, recycled, or reclaimed supplies. Venting R-22 remains illegal, it was never a natural refrigerant, and new systems use non-ozone-depleting refrigerants. The phaseout follows the Montreal Protocol schedule for HCFCs.
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