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Bard 171-195 is an OEM heat exchanger used in Bard DCH series wall mounted heating and cooling equipment. This component is responsible for transferring heat safely and efficiently, so a worn or damaged heat exchanger can lead to poor heating performance, nuisance shutdowns, or unsafe operation. Replacing it with the correct Bard factory part helps restore proper heat output and maintains the designed airflow and burner to exchanger alignment inside the unit. Confirm unit model and serial number compatibility before ordering, since DCH applications can vary by size and configuration.