R-290 is another name for Propane. The Environmental Protection Agency recently approved (2015) propane as viable refrigerant alternative to the HFCs and CFCs that are on the market today. While propane has zero Ozone depletion potential and low global warming potential it is extremely flammable. If you are installing a propane unit ensure the utmost safety and that you know exactly how the system and the refrigerant interact with each other.
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