R290 gas charging with safety

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propane R290
R290 room ACs are successfully developed and are being marketed . the R290 newly designed room ACs have better energy efficiency. it is in excellent alternative to HCFC-22 in the current situation, as it has zero ozone depleting potential and negligible global warming potential.it is a highly flammable refrigerator,so safety issues to be addressed adequately. it is commercially available and used by many countries including india.