Screw compressor GA 37+ -75 FF Model GA 37+ -75 (GA 37+, GA 45+, GA 55 and GA 75)Model GA 37+ -75 (GA 37+, GA 45+, GA 55 and GA 75)Standard Scope of SupplyThe GA 37+ -75 is an air or water cooled, silenced, rotary screw compressor. ... assure optimized cooling and low noise levels, the GA 37+ -75 compressors have one main radial cooling fan, rotating at low speed. Screw compressor GA 37+ -75 FF