Refrigeration, Air Conditioning, and Air Circulating Equipment (FSG 41) 5 rows found FSC 4110 - Refrigeration Equipment FSC 4120 - Air Conditioning Equipment FSC 4130 - Refrigeration and Air Conditioning Components FSC 4140 - Fans, Air Circulators, and Blower Equipment FSC 4150 - Vortex Tubes and Other Related Cooling Tubes