... & 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, ... ,300,400,500,600,700 2. square counter flow shallow water pond type:GFNLDP-75, 100,150,200,250,300 ... introduction for symbols: (Ⅱ)---mid-temperature type; F---square counter current;方形 G--- high-temperature type;高温,工业型 J---water collecting type;集水型 S---low noised;低噪声 SS--- ...