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Meeting the need for lower global warming potential refrigerants, ZS*KA is approved for use with R-404A, R507, R448A (-30 to +45°F), R407C, R22, R134a (0 to 45°F) and R-407A (25 to 45°F). The ZS*KA also offers an extended operating envelope, covering the ZS*K4, ZB*KC, and CS*K6 operating envelopes.