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Bard part number 5070-002 is an OEM heat recovery cassette assembly used with compatible 5 ton Bard wall mount ventilation and heat recovery configurations. The cassette is the removable core module that supports the heat recovery media and moving components inside the ventilator section, allowing the unit to transfer heat from exhaust air to incoming outdoor air to help reduce heating and cooling load while maintaining ventilation. Replacing a worn or damaged cassette helps restore proper airflow balance and heat transfer, and using a genuine Bard 5070-002 ensures the correct fit, clearances, and performance within the factory-designed cassette track and seals. Verify compatibility by matching the full Bard model and serial information and referencing the correct parts manual before ordering.