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Bard part number 164-552 is an OEM plenum channel used inside Bard wall mount HVAC cabinets to help form and support the plenum area so supply air is guided correctly through the unit and toward the discharge path. When a channel is bent, corroded, or missing after service, replacing it helps restore proper internal airflow routing and keeps adjoining panels and components aligned the way Bard intended, which can reduce air bypass and rattles that show up after repairs. As a genuine Bard replacement part, 164-552 is built for the correct fit in compatible Bard equipment, so match it to your unit model and serial requirements before ordering to avoid installation delays.