When the same customer expanded its operation with heat recovery from another 30000 m3⁄h (18000 cfm) of general ventilation air Gupex AS was again chosen to supply the heat exchanger. However this time the rugged GRP air–air plate type was not selected but instead an ordinary aluminium plate type was used, but placed inside a GUPEX sandwich casing. The reason for this hybrid solution was that although the extracted air was not corrosive, the heat exchanger unit itself was positioned in a corrosive environment. The solid corrosion proof GUPEX® casing provided excellent protection against this environment.
It is standard practice for Gupex AS to provide optimal purpose–designed air handling heat recovery solutions like in this case.