... 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- ... 300, 400,500,600,750,900,1050 3. square counter flow low noised deep water pond type深水盘:DFNGP- ... ,200,250,300,400,500,600,700 3. square counter flow industrial deep water pond type:GFNLGP- ... for symbols: (Ⅱ)---mid-temperature type; F---square counter current;方形 G--- high-temperature type;高温,工业型 J---water ...