RNC Series Non-Cycling refrigerated air dryers are engineered to benefit you for a lifetime with the tradition of durability that is Gardner Denver. All models use reliable refrigeration compressors and environmentally friendly refrigerants. Models through RNC750 use proven reciprocating refrigeration compressors with R-134a refrigerant. RNC1000 through RNC3000 incorporate rugged scroll compressors with R-404a refrigerant. You benefit from long component life and efficient 24/7 performance.