Gupex AS have for over 25 years made their own proprietary industrial plastic corrosion and acid resistant air to air heat exchanger, designed for energy recovery in many corrosive industrial air processes. Where other heat exchangers only last a short time, the GUPEX® air heat exchanger goes on and on. Some GUPEX® units are still recovering heat energy after more than 20 years in humid, corrosive and dusty air with acidic water condensing through the heat exchanger plates. The air to air heat exchanger is made of glass fibre reinforced plastic, GRP, with the casing made of polyester sandwich material. This gives a rigid, lightweight construction with excellent thermal insulation.