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[Philbert89]

 Air conditioner manufacturers, including window and portable models, have had to make some changes in recent years. This is because of something called the Restriction of Hazardous Substances Standards (RoHS) passed by the European Union a few years ago, and US laws restricting manufacture and use of certain hazardous substances. Part of these standards include phasing out the old R22 refrigerant, which has long been known as an ozone depleting agent.