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Bard 501-750-1 is an OEM plenum left side assembly used on select Bard wall-mounted HVAC and plenum accessory configurations to properly form and seal the supply/return air path while maintaining correct airflow direction and cabinet alignment. This sheet metal plenum component helps keep air contained where it belongs, reducing air bypass and supporting a clean, secure connection to the rest of the plenum and unit cabinet. Because plenum and cabinet parts can vary by model series and configuration, match 501-750-1 to your unit model and serial or the correct Bard parts breakdown before ordering to ensure proper fit and screw-hole alignment.