It's commonly used in heating, cooling, and ventilation systems in vehicles. Hot coolant from the engine block passes through the heater, warming up the intake air blown on its surface by the interior blower.
Heater Matrix 73980 Nissens Exchanger Interior 5Q0819031 5Q0819031B
Land Rover Discovery 3 Heater Matrix GENUINE NISSENS Brand 04-09 LR017030
Heater Matrix 73943 Nissens Exchanger Interior 5Q0819031A
Heater Matrix 71441 Nissens Exchanger Interior 46721967 46722546 60813252
Nissens Cabin Heater Core 73980 for eg. VW GOLF (2013) 1.2 TSI BLUEMOTION etc
NISSENS Interior Heater Matrix 71453 for FIAT 500 (2008) 1.2 etc