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Bard part number 5070-012 is an OEM Energy Recovery Cassette for select 2 ton Bard wall-mounted units equipped with the energy recovery ventilation option. This cassette is the core air-to-air exchange module that transfers energy between exhaust and incoming outdoor air to support required ventilation while helping reduce the load on the HVAC system. When an existing cassette is damaged, restricted, or not performing as designed, replacing it with the correct Bard OEM 5070-012 helps restore proper ventilation operation and efficiency without guesswork on fit. Confirm compatibility by matching your unit model and serial number to the applicable Bard parts list before ordering.