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Bard part number 131-158-4 is an OEM filter rack wrapper used on select Bard HVAC equipment to form the sheet metal wrap section of the filter rack assembly, helping guide return airflow through the filter area and keeping the filter rack properly aligned for a consistent seal. Replacing a bent or damaged wrapper helps prevent filter bypass, reduces air leaks around the rack, and makes routine filter changes go smoother because the rack and door fit the way the unit was designed. Since fit can vary by model series, confirm compatibility using the unit model and serial number or the correct parts manual before ordering to ensure 131-158-4 matches your specific Bard unit.