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Bard 8620-185 is an OEM economizer conversion kit used to add or restore economizer (free cooling) capability on compatible Bard wall-mount HVAC equipment by integrating the outside air damper components and related conversion hardware so the unit can use suitable outdoor air conditions to reduce compressor run time. This is a factory-correct Bard kit intended to match original fit and function, and it is commonly referenced as being superseded by the newer Bard economizer kit 8620-239, so verifying your unit model and required kit number in the Bard literature before ordering is recommended.