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Bard part number S131Y164 is an OEM left hand filter tray used in Bard wall mounted HVAC equipment to properly support and position the air filter so the unit can maintain correct airflow across the indoor coil and protect internal components from dust and debris. A damaged or missing tray can lead to filter bypass, reduced airflow, and nuisance service issues, so replacing it with the correct Bard factory part helps restore the intended fit and filtration path. Since left hand and right hand filter tray layouts can vary by model and cabinet configuration, confirm the unit model and filter access orientation before ordering to ensure S131Y164 matches your application.