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Bard part 135-217 is an OEM inner air baffle used inside certain Bard wall-mounted HVAC units to separate and guide the airstream through the correct internal path. A properly installed baffle helps keep airflow moving where it is intended across the heat transfer and air-moving sections, which supports stable temperatures, safer operation, and reduced air bypass that can lead to noise or performance complaints. This is a fit-critical internal sheet metal component, so confirm your unit model and serial number against the Bard parts breakdown before ordering to ensure the 135-217 baffle matches your cabinet configuration and revision.