The GRF series refrigeration system is designed for reliable operation and heavy duty application. This system utilizes ultra-low pressure drop stainless steel heat exchangers to process compressed air flows from 10-2750 SCFM. It is controlled by a highly reliable automatic or thermostatic expansion valve rather than non-adjusting capillary tube systems that can cause refrigeration compressors to fail prematurely. Great Lakes dryers are the among the elite in air treatment.