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The result is a less reliable seal and increased chances for leaks and performance loss. This is in contrast to other manufacturers who use an epoxy gel to seal around each tube. With this process the bond between the components is stronger than the surrounding polymer. The mechanism we use to bond each individual tube to the header is a special chemical process. Our indirect evaporative cooling polymer has been tested for capacity and reliability for over 30 years. Other components include a recirculating pump, spray nozzles and a water sump that deliver water to the inside of the heat exchanger. This allows the airstream which contacts the outer wall to be sensibly cooled. When the water evaporates, the heat of vaporization imparts a cooling effect to the outer wall of the heat exchanger. Indirect evaporative cooling occurs when water sprayed to the interior wall of a heat exchanger evaporates. The inner wall is in contact with air that comes from the ambient environment or building exhaust. The outer wall of the heat exchanger contacts air that needs to be conditioned before it is delivered to the occupied space. With indirect evaporative cooling, there are two opposing airstreams that contact a different side of a polymer heat exchanger.