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Bard part number 7003-017 is an OEM air filter designed to protect the indoor coil and blower section by capturing airborne dirt and lint while maintaining proper airflow through the unit. This filter is listed in Bard permanent filter specifications as an indoor rigid pad style filter in an actual size of 4 x 26 x 1 inches, making it important to match both the part number and dimensions for correct fit and to avoid air bypass that can reduce performance. For best results, confirm the part number against your unit model and service literature before ordering, especially on older installations where multiple filter styles may have been used across similar cabinets.