... ,400,500,600 二、Low temperature reducing 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 ... , 200, 300, 400, 500, 600,750,900,1050 2. square counter flow low noised shallow water pond type浅水盘:DFNDP-100, 150, 200 ... ,1050三、Mid & high temperature reducing 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 ...