... type, 低温降DFN series,降5或8度 1. square counter flow low noised water pond free type方形无水盘:DFNL-100, 150, 200, 300, 400, 500 ... , 600,750,900,1050 2. square counter flow low noised ... industrial type中高温降, GFN series,降10或20度 1. square counter flow water pond free type:GFNL-75, 100,150,200,250,300,400 ...